Philippine Council for Agriculture and Resources Research. (1977). The Philippines recommends for duck raising. PCARRD.
Chicago-viite (17. p.)Philippine Council for Agriculture and Resources Research. The Philippines Recommends for Duck Raising. Los Banos, Laguna: PCARRD, 1977.
MLA-viite (9. p.)Philippine Council for Agriculture and Resources Research. The Philippines Recommends for Duck Raising. PCARRD, 1977.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.