Não informado. (2012). Purdue Agriculture Reports. Purdue University, Agricultural Experiment Station.
Citação do estilo Chicago (17ª ed.)Não informado. Purdue Agriculture Reports. West Lafayette, Ind: Purdue University, Agricultural Experiment Station, 2012.
Citação MLA (8ª ed.)Não informado. Purdue Agriculture Reports. Purdue University, Agricultural Experiment Station, 2012.
Atenció: Aquestes cites poden no estar 100% correctes.