APA (7th ed.) Citation

Hartley, I., & Hartley, E. (1970). The Expanding universe of sculpture. Hartley Productions.

Chicago Style (17th ed.) Citation

Hartley, Irving, and Elda Hartley. The Expanding Universe of Sculpture. [S.l.]: Hartley Productions, 1970.

MLA (9th ed.) Citation

Hartley, Irving, and Elda Hartley. The Expanding Universe of Sculpture. Hartley Productions, 1970.