APA (7th ed.) Citation

Cohen, P. R. (1974). A prototype natural language understanding system. Univ. of Toronto, Dep. of Computer Science.

Chicago Style (17th ed.) Citation

Cohen, Philip R. A Prototype Natural Language Understanding System. Toronto: Univ. of Toronto, Dep. of Computer Science, 1974.

MLA (9th ed.) Citation

Cohen, Philip R. A Prototype Natural Language Understanding System. Univ. of Toronto, Dep. of Computer Science, 1974.