APA
Duncan E. R., . (1977). Dimensions of World Food Problems. The iowa state university, Ames: .
Chicago
Duncan E R, . 1977. Dimensions of World Food Problems. The iowa state university, Ames: .
Harvard
Duncan E. R., . (1977). Dimensions of World Food Problems. The iowa state university, Ames: .
MLA
Duncan E R, . Dimensions of World Food Problems. The iowa state university, Ames: . 1977.