Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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