Gaya APA

Helmuth, J, W. et al (1989). 1988 World food conference proceedings / editor, John W. Helmuth, Stanley R. Johnson (Ed.ke-1). : Iowa State University Press for the Center of Agricultural and Rural Development.

Gaya MLA

Helmuth, John, W.. et al. "1988 World food conference proceedings / editor, John W. Helmuth, Stanley R. Johnson". Ed.ke-1 : Iowa State University Press for the Center of Agricultural and Rural Development, 1989. Textbook.