APA (7th ed.) Citation
Wolfram, S. (1991). Mathematica: A system for doing mathematics by computer (2nd ed.). Addison-Wesley Pub. Co..
Chicago Style (17th ed.) Citation
Wolfram, Stephen. Mathematica: A System for Doing Mathematics by Computer. 2nd ed. Reading, Mass.: Addison-Wesley Pub. Co., 1991.
MLA (9th ed.) Citation
Wolfram, Stephen. Mathematica: A System for Doing Mathematics by Computer. 2nd ed. Addison-Wesley Pub. Co., 1991.
Warning: These citations may not always be 100% accurate.