APA (7th ed.) Citation

Roh, F., Roh, J., Hutter, C., & Phelps, J. (1968). German art in the 20th century. New York Graphic Society.

Chicago Style (17th ed.) Citation

Roh, Franz, Julianne Roh, Catherine Hutter, and Julia Phelps. German Art in the 20th Century. Greenwich, Conn: New York Graphic Society, 1968.

MLA (9th ed.) Citation

Roh, Franz, et al. German Art in the 20th Century. New York Graphic Society, 1968.