APA (7th ed.) Citation

Adobe Systems, Adobe Systems Incorporated, Engstrom, P., & Walden, J. (1990). PostScript language reference manual (2nd ed.). Addison-Wesley.

Chicago Style (17th ed.) Citation

Adobe Systems, Adobe Systems Incorporated, Paul Engstrom, and Jeff Walden. PostScript Language Reference Manual. 2nd ed. Reading, Mass: Addison-Wesley, 1990.

MLA (9th ed.) Citation

Adobe Systems, et al. PostScript Language Reference Manual. 2nd ed. Addison-Wesley, 1990.