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.
Trích dẫn kiểu Chicago (xuất bản lần thứ 7)International Symposium on Flower Bulbs Seattle, Wash, International Society for Horticultural Science. Section for Ornamental Plants, Gary A. Chastagner, Robert P. Doss, và Ralph S. Byther. Symposium on Flower Bulbs: Seattle, Washington, USA, 10-14 July 1989. Wageningen, Netherlands: International Society for Horticultural Science, 1990.
Trích dẫn kiểu MLA (xuất bản lần thứ 8)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.