Não informado. (2007). Report of the Division of the Agriculture. Iowa State College, Division of the Agriculture.
Citação do estilo Chicago (17ª ed.)Não informado. Report of the Division of the Agriculture. Ames, Iowa: Iowa State College, Division of the Agriculture, 2007.
Citação MLA (8ª ed.)Não informado. Report of the Division of the Agriculture. Iowa State College, Division of the Agriculture, 2007.
警告：这些引文格式不一定是100％准确.