APA (7th ed.) Citation

Mark, R. (1997). Robert Willis, Viollet-le-Duc and the structural approach to Gothic architecture.

Chicago Style (17th ed.) Citation

Mark, Robert. Robert Willis, Viollet-le-Duc and the Structural Approach to Gothic Architecture. 1997.

MLA (9th ed.) Citation

Mark, Robert. Robert Willis, Viollet-le-Duc and the Structural Approach to Gothic Architecture. 1997.

Warning: These citations may not always be 100% accurate.