Não informado. (1920). Agricultural Engineering. American Society of Agricultural Engineers.
Chicago-Zitierstil (17. Ausg.)Não informado. Agricultural Engineering. St. Joseph, Mich: American Society of Agricultural Engineers, 1920.
MLA-Zitierstil (8. Ausg.)Não informado. Agricultural Engineering. American Society of Agricultural Engineers, 1920.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.