1- Andrade-Rodriguez M., Guillen-Sanchez D., Villegas-Torres O.G., Ayala-Hernandez J.J., Lopez-Martinez V., and Vargas-Araujo J. 2015. Bulb cutting methods to propagate Hippeastrum hybridum Hort. Revista Chapingo Serie Horticultura, 21:57-69.
2- Brown S.P., and Black R.J. 2007. Amaryllis, University of Florida, IFAS Extension.
3- Clemson Extension, 1995. Understanding and producing amaryllis. Clemson Extension. Horti. L 63.
4- De Bruyn M.H. 1997. Micropropagation of amaryllis (Hippeastrum×hybridum). In: Bajaj, Y.P.S. Biotechnology in Agriculture and Forestry 40, High-Tech and Micropropagation VI. Springer Verlag, Heidelberg, New York, pp 1-13.
5- De Gelder A. 1990. Variety evaluation of hippeastrum. Acta Horticulture, 226: 273-275.
6- Dohare S.R., 1989. Amaryllis and Hippeastrum. In: Commercial Flowers. T. K. Bose, R.G. Maiti, R.S. Dhva, (Eds.). Naya prokash, Calcutta, 573-593.
7- El-Naggar A.H., and El-Nasharty A.B. 2009. Effect of growing media and fertilization on growth, flowering, bulbs productivity and chemical constituents of Hippeastrum vittatum, Herb. American-Eurasian Journal of Agricultural & Environmental Sciences, 6:360-371.
8- Ephrath E., Ben-Asher J., Baruchin F., Alekperov C., Dayan E., and Silberbush M. 2001. Various cutting methods for the propagation of Hippeastrum bulbs. Biotronics, 30:75-83.
9- Fennell C.W., 2013. Crinum moorei: propagation and secondary metabolite production in vitro. University of KwaZulu-Natal. Thesis for the degree of Ph.D in Botany.
10- Huang C.W., Okubo, H., and Uemoto S. 1990a. Importance of two scales in propagating Hippeastrum hybridum by twin scaling. Scientia horticulturae, 42(1-2):141-149.
11- Huang C.W., Okubo, H., and Uemoto S. 1990b. Comparison of the bulblet formation from twin scales and single scales in Hippeastrum hybridum cultured in vitro. Scientia horticulturae, 42(1-2):151-160.
12- Hanks G. 2015. A review of production statistics for the cut flower and foliage sector 2015 (part of AHDB Horticulture funded project PO BOF 002a). The national cut flower center, AHDB.
13- Hubner S. 2014. International Statistics flowers And Plants 2014. Volume 62, center for Business Management in Horticulture and applied research, leibniz University Hanover, Germany.
14- Jamil M.K., Rahman M.M., and Rahman M.M. 2014. Effect of Bulb Cutting and Pot Medium on Propagation of Hippeastrum (Hippeastrum hybridum Hort.). Journal of Ornamental Plants, 4(3): 123-132.
15- Marinangeli P.A., Hernandez L.F., Pellegrini C.P., and Curvetto N.R. 2003. Bulblet Differentiation after Scale Propagation of Lilium longiflorum. Journal of the American Society for Horticultural Science, 128(3): 324-329. 2003.
16- Meerow A.W., Broscht T.K., and Kane M.E. 1991. Hippeastrum breeding at the University of Florida. Herberita, 47: 4-10.
17- Padasht M.N., Khalighi A., Naderi R., and Mousavi A. 2005. The investigation of different methods for culturing and propagation of Chelcheragh lily (Lilium ledebourii), native of Iran, and its introduction possibility as a new floricultural crop. Islamic Azad University, Science and Research Unit. Thesis for the degree of Ph.D in horticulture (in Persian with English abstract).
18- Sharifi A., Moshtaghi N., and Bagheri A. 1994. Applied Plant tissue culture, Jahad daneshgahi Mashhad publisher, Mashhad (in Persian).
19- Silberbush M., Ephrath J.E., Alekperov Ch., and Ben-Asher J. 2003. Nitrogen and potassium fertilization interactions with carbon dioxide enrichment in Hippeastrum bulb growth. Scientia Horticulturae, 98:85-90.
20- Smith R.H., Burrow J., and Kurten K. 1999. Challenges associated with micropropagation of Zephyranthes and Hippestarum sp. (Amaryllidaceae). In Vitro Cellular and Developmental Biology - Plant, 35(4): 281-282.
21- Tombolato A.F.C., Azevedo C., and Nagai V. 1994. Effects of Auxin Treatments on in Vivo Propagation of Hippeastrum hybridum Hort. by Twin Scaling. Hort science, 29(8):922.
22- Witomska M., Ilczuk A., and Zalewska I. 2005. Effect of cutting size on propagation efficiency of Hippeastrum × chemielii by scale cuttings. Propagation of Ornamental Plants, 4:205-209.
23- Yuan Y.L., Zhang Y.L., Zhao J.L., Zhao J. 2008. Study on the method of scale propagation of Amaryllis vittata. Journal of Northwest A & F University, Natural Science Edition, 36:108-112.
24- Zhang W., Song L., Teixeira da silva J.A., and Sun H. 2013. Effects of temperature, plant growth regulators and substrates and changes in carbohydrate content during bulblet formation by twin scale propagation in Hippeastrum vittatum Red Lion. Scienntia Horticulturae, 160:230-237.
25- Zhu Y., Lui K.S., and Yiu J.C. 2005. Effect of cutting method on bulb production of Hippeastrum hybridumin in Taiwan. Acta Horticulturae, 673: 531-535.