APA (7th ed.) Citation

Horn, G. F. (1975). Principles of design: Balance and unity. Davis Pub.

Chicago Style (17th ed.) Citation

Horn, George F. Principles of Design: Balance and Unity. Worcester, Mass: Davis Pub, 1975.

MLA (9th ed.) Citation

Horn, George F. Principles of Design: Balance and Unity. Davis Pub, 1975.