Não informado. (1907). Proceedings of the American Society of Agronomy. American Society of Agronomy.
Chicago-viite (17. p.)Não informado. Proceedings of the American Society of Agronomy. Washington: American Society of Agronomy, 1907.
MLA-viite (8. p.)Não informado. Proceedings of the American Society of Agronomy. American Society of Agronomy, 1907.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.