APA (7th ed.) Zitazioa

Howard, T. L., Hewitt, W. T., Hubbold, R. L., & Wyrmas, K. M. (1991). A practical introduction to PHIGS and PHIGS PLUS. Addison-Wesley.

Chicago Style (17th ed.) Zitazioa

Howard, T. L., W. T. Hewitt, R. L. Hubbold, eta K. M. Wyrmas. A Practical Introduction to PHIGS and PHIGS PLUS. Wokingham: Addison-Wesley, 1991.

MLA (9th ed.) Zitazioa

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