Não informado. (1920). Agricultural Engineering. American Society of Agricultural Engineers.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Agricultural Engineering. St. Joseph, Mich: American Society of Agricultural Engineers, 1920.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Agricultural Engineering. American Society of Agricultural Engineers, 1920.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.