APA
Duncan E. R., . (1977). Dimensions of world food problems. Ames: Iowa university press.
Chicago
Duncan E R, . 1977. Dimensions of world food problems. Ames: Iowa university press.
Harvard
Duncan E. R., . (1977). Dimensions of world food problems. Ames: Iowa university press.
MLA
Duncan E R, . Dimensions of world food problems. Ames: Iowa university press. 1977.