APA (7th ed.) Citation

Crossley, J. N. (1990). What is mathematical logicn QA9 .W. Dover Publications.

Chicago Style (17th ed.) Citation

Crossley, John N. What Is Mathematical Logicn QA9 .W. New York: Dover Publications, 1990.

MLA (9th ed.) Citation

Crossley, John N. What Is Mathematical Logicn QA9 .W. Dover Publications, 1990.