Cita APA (7th ed.)

(1995). Programmer's Hierarchical Interactive Graphics System (PHIGS).

Cita Chicago (17th ed.)

Programmer's Hierarchical Interactive Graphics System (PHIGS). 1995.

Cita MLA (9th ed.)

Programmer's Hierarchical Interactive Graphics System (PHIGS). 1995.

Atenció: Aquestes cites poden no estar 100% correctes.