Shepherd, G. S., & Futrell, G. A. (1969). Marketing farm products; economic analysis (5th ed.). Iowa State University Press.
Chicago Style (17. basım) AtıfShepherd, Geoffrey Seddon, ve Gene A. Futrell. Marketing Farm Products; Economic Analysis. 5th ed. Ames: Iowa State University Press, 1969.
MLA (9th ed.) AtıfShepherd, Geoffrey Seddon, ve Gene A. Futrell. Marketing Farm Products; Economic Analysis. 5th ed. Iowa State University Press, 1969.