APA (7th ed.) Citation

Gaman, W. A., & Giovinazzo, W. A. (1991). PHIGS by example. Springer.

Chicago Style (17th ed.) Citation

Gaman, William A., and William A. Giovinazzo. PHIGS by Example. New York u.a: Springer, 1991.

MLA (9th ed.) Citation

Gaman, William A., and William A. Giovinazzo. PHIGS by Example. Springer, 1991.