APA (7th ed.) Citation

Held, M., Champenois, M., & Powis, E. (2014). Marc Held: 50 ans de design = 50 years of design. Norma.

Chicago Style (17th ed.) Citation

Held, Marc, Michèle Champenois, and Eileen Powis. Marc Held: 50 Ans De Design = 50 Years of Design. Paris: Norma, 2014.

MLA (9th ed.) Citation

Held, Marc, et al. Marc Held: 50 Ans De Design = 50 Years of Design. Norma, 2014.