Não informado. (1976). Quick bibliography series. National Agricultural Library, Department of Agriculture.
Chicago-viite (17. p.)Não informado. Quick Bibliography Series. Beltsville, Md: National Agricultural Library, Department of Agriculture, 1976.
MLA-viite (8. p.)Não informado. Quick Bibliography Series. National Agricultural Library, Department of Agriculture, 1976.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.