APA (7e ed.) Bronvermelding

ebrary, Inc, Tweeten, L. G., & Thompson, S. R. (2002). Agricultural policy for the 21st century. Iowa State Press.

Chicago (17e ed.) Bronvermelding

ebrary, Inc, Luther G. Tweeten, en Stanley R. Thompson. Agricultural Policy for the 21st Century. Ames: Iowa State Press, 2002.

MLA (9e ed.) Bronvermelding

ebrary, Inc, et al. Agricultural Policy for the 21st Century. Iowa State Press, 2002.