APA (7th ed.) Citation

Lewcock, R. B. (1986). The old walled city of San'a. Unesco.

Chicago Style (17th ed.) Citation

Lewcock, Ronald B. The Old Walled City of San'a. Paris: Unesco, 1986.

MLA (9th ed.) Citation

Lewcock, Ronald B. The Old Walled City of San'a. Unesco, 1986.