Não informado. (1969). Journal of the American Society for Horticultural Science. American Society for Horticultural Science.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Journal of the American Society for Horticultural Science. Alexandria, Va: American Society for Horticultural Science, 1969.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Journal of the American Society for Horticultural Science. American Society for Horticultural Science, 1969.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.