Não informado. (1969). Journal of the American Society for Horticultural Science. American Society for Horticultural Science.
Chicago-referens (17:e uppl.)Não informado. Journal of the American Society for Horticultural Science. Alexandria, Va: American Society for Horticultural Science, 1969.
MLA-referens (8:e uppl.)Não informado. Journal of the American Society for Horticultural Science. American Society for Horticultural Science, 1969.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.