MLA

Iordan, Iorgu, and John Orr. An Introduction to Romance Linguistics : Its Schools and Scholars. London: Methuen, 1937.

APA

Iordan, I., & Orr, J. (1937). An introduction to romance linguistics : its schools and scholars. London: Methuen.

Chicago

Iordan, Iorgu, An Introduction to Romance Linguistics : Its Schools and Scholars. Edited by John Orr. London: Methuen, 1937.