Não informado. (1971). South African journal of animal science. South African Society of Animal Production.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. South African Journal of Animal Science. Pretoria, Africa do Sul: South African Society of Animal Production, 1971.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. South African Journal of Animal Science. South African Society of Animal Production, 1971.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.