APA (7th ed.) Citation

Christensen, E. O. (1948). Popular art in the United States. Penguin.

Chicago Style (17th ed.) Citation

Christensen, Erwin Ottomar. Popular Art in the United States. London: Penguin, 1948.

MLA (9th ed.) Citation

Christensen, Erwin Ottomar. Popular Art in the United States. Penguin, 1948.

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