Cita APA (7th ed.)

Zahran, M. M. (1973). Challenges of the urban environment. Beirut Arab University.

Cita Chicago (17th ed.)

Zahran, Mohsen Moharram. Challenges of the Urban Environment. Beirut: Beirut Arab University, 1973.

Cita MLA (9th ed.)

Zahran, Mohsen Moharram. Challenges of the Urban Environment. Beirut Arab University, 1973.