Παραπομπή σε μορφή APA (7η εκδ.)

Singh, G. S. (1985). The negative exponential model: A synthesis of rank, gravity, and entropy functions in urban geography. Govind Ballabh Pant Social Science Institute.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Singh, Govind Saran. The Negative Exponential Model: A Synthesis of Rank, Gravity, and Entropy Functions in Urban Geography. Allahabad: Govind Ballabh Pant Social Science Institute, 1985.

Παραπομπή σε μορφή MLA (8th εκδ.)

Singh, Govind Saran. The Negative Exponential Model: A Synthesis of Rank, Gravity, and Entropy Functions in Urban Geography. Govind Ballabh Pant Social Science Institute, 1985.