APA (7th ed.) Citation

Focillon, H., Hogan, C. B., & Kubler, G. (1992). The life of forms in art. Zone Books.

Chicago Style (17th ed.) Citation

Focillon, Henri, Charles B. Hogan, and George Kubler. The Life of Forms in Art. New York: Zone Books, 1992.

MLA (8th ed.) Citation

Focillon, Henri, et al. The Life of Forms in Art. Zone Books, 1992.