APA (7th ed.) Citation

Helm, M. (1941). Modern Mexican painters. Harper & brothers.

Chicago Style (17th ed.) Citation

Helm, MacKinley. Modern Mexican Painters. New York: Harper & brothers, 1941.

MLA (9th ed.) Citation

Helm, MacKinley. Modern Mexican Painters. Harper & brothers, 1941.

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