Não informado. (1978). Agricultural Reviews and Manuals. Science and Education Administration.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Agricultural Reviews and Manuals. Berkeley, Calif: Science and Education Administration, 1978.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Agricultural Reviews and Manuals. Science and Education Administration, 1978.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.