Não informado. (1975). Agricultural Libraries Information Notes. Technical Information Systems, National Agricultural Library.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Agricultural Libraries Information Notes. Beltsville, Md: Technical Information Systems, National Agricultural Library, 1975.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Agricultural Libraries Information Notes. Technical Information Systems, National Agricultural Library, 1975.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.