Παραπομπή σε μορφή APA (7η εκδ.)

Heady, E. O., & Srivastava, U. K. (1975). Spatial sector programming models in agriculture. Iowa State university.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Heady, Earl O., και Uma K. Srivastava. Spatial Sector Programming Models in Agriculture. Ames: Iowa State university, 1975.

Παραπομπή σε μορφή MLA (9th εκδ.)

Heady, Earl O., και Uma K. Srivastava. Spatial Sector Programming Models in Agriculture. Iowa State university, 1975.