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