H., B., F. et al.(1990).The Sociology of agriculture / Frederick H. Buttel, Olaf F. Larson, Gilbert W. Gillespie .New York:Greenwood Press.
Gaya MLA
Buttel, Frederick, H.. et al."The Sociology of agriculture / Frederick H. Buttel, Olaf F. Larson, Gilbert W. Gillespie".New York:Greenwood Press,1990.Textbook.