Cita APA

Leopold Center for Sustainable Agriculture, & Leopold Center for Sustainable Agriculture. (1991). Annual report. Ames, Iowa: The Center.

Citación estilo Chicago

Leopold Center for Sustainable Agriculture, y Leopold Center for Sustainable Agriculture. Annual Report. Ames, Iowa: The Center, 1991.

Cita MLA

Leopold Center for Sustainable Agriculture, y Leopold Center for Sustainable Agriculture. Annual Report. Ames, Iowa: The Center, 1991.