Não informado. (1970). Extension Bulletin. Asian and Pacific Council, Food and Fertilizer Technology Center.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Extension Bulletin. Taipei: Asian and Pacific Council, Food and Fertilizer Technology Center, 1970.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Extension Bulletin. Asian and Pacific Council, Food and Fertilizer Technology Center, 1970.
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