Cita APA (7a ed.)

Babian, H. (1961). The permanent frontier. Institute of Economic Affairs New. York University.

Cita Chicago Style (17a ed.)

Babian, Haig. The Permanent Frontier. New York: Institute of Economic Affairs New. York University, 1961.

Cita MLA (9a ed.)

Babian, Haig. The Permanent Frontier. Institute of Economic Affairs New. York University, 1961.