Não informado. (1937). Agricultural Education. American Vocational Association, Agricultural Section.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Agricultural Education. Des Moines, Iowa: American Vocational Association, Agricultural Section, 1937.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Agricultural Education. American Vocational Association, Agricultural Section, 1937.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.