Citazione Stile APA (7a Edizione)

Unger, M. A., & Karvel, G. R. (1987). Real estate: Principles and practices (8a. ed.). South-Western.

Citazione stile Chigago Style (17a edizione)

Unger, Maurice Albert, e George R. Karvel. Real Estate: Principles and Practices. 8a. ed. Cincinnati: South-Western, 1987.

Citatione MLA (9a ed.)

Unger, Maurice Albert, e George R. Karvel. Real Estate: Principles and Practices. 8a. ed. South-Western, 1987.