Não informado. (1937). Agricultural Education. American Vocational Association, Agricultural Section.
Chicago-Zitierstil (17. Ausg.)Não informado. Agricultural Education. Des Moines, Iowa: American Vocational Association, Agricultural Section, 1937.
MLA-Zitierstil (8. Ausg.)Não informado. Agricultural Education. American Vocational Association, Agricultural Section, 1937.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.