Cita APA (7a ed.)

Howard, T. L. J. (1991). A practical introduction to PHIGS and PHIGS PLUS. Addison-Wesley.

Cita Chicago Style (17a ed.)

Howard, T. L. J. A Practical Introduction to PHIGS and PHIGS PLUS. Wokingham [etc.]: Addison-Wesley, 1991.

Cita MLA (9a ed.)

Howard, T. L. J. A Practical Introduction to PHIGS and PHIGS PLUS. Addison-Wesley, 1991.