Não informado. Plant Immigrants. U.S. Department of Agriculture, Bureau of Plant Industry.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Plant Immigrants. Washington: U.S. Department of Agriculture, Bureau of Plant Industry.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Plant Immigrants. U.S. Department of Agriculture, Bureau of Plant Industry.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.