Não informado. (1937). Agricultural Education. American Vocational Association, Agricultural Section.
Cita Chicago Style (17a ed.)Não informado. Agricultural Education. Des Moines, Iowa: American Vocational Association, Agricultural Section, 1937.
Cita MLA (8a ed.)Não informado. Agricultural Education. American Vocational Association, Agricultural Section, 1937.
Precaución: Estas citas no son 100% exactas.