Gaya APA

Helmuth, J. et al (1989). 1988 world food conference proceedings / editor, John W. Helmuth, Stanley R. Johnson (Ed.ke-1). Iowa: Iowa State University Press.

Gaya MLA

Helmuth, John. et al. "1988 world food conference proceedings / editor, John W. Helmuth, Stanley R. Johnson". Ed.ke-1 Iowa: Iowa State University Press, 1989. Textbook.