Não informado. (1924). Agricultural Progress. Agricultural Education Association.
Chicago-Zitierstil (17. Ausg.)Não informado. Agricultural Progress. London: Agricultural Education Association, 1924.
MLA-Zitierstil (8. Ausg.)Não informado. Agricultural Progress. Agricultural Education Association, 1924.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.