International Symposium on Flower Bulbs Seattle, Wash, International Society for Horticultural Science. Section for Ornamental Plants, Chastagner, G. A., Doss, R. P., & Byther, R. S. (1990). Symposium on Flower Bulbs: Seattle, Washington, USA, 10-14 July 1989. International Society for Horticultural Science.
Chicago-referens (17:e uppl.)International Symposium on Flower Bulbs Seattle, Wash, International Society for Horticultural Science. Section for Ornamental Plants, Gary A. Chastagner, Robert P. Doss, och Ralph S. Byther. Symposium on Flower Bulbs: Seattle, Washington, USA, 10-14 July 1989. Wageningen, Netherlands: International Society for Horticultural Science, 1990.
MLA-referens (8:e uppl.)International Symposium on Flower Bulbs Seattle, Wash, et al. Symposium on Flower Bulbs: Seattle, Washington, USA, 10-14 July 1989. International Society for Horticultural Science, 1990.