APA (7th ed.) Citation

Crossley, J. N. (1972). What is mathematical logic. Oxford University Press.

Chicago Style (17th ed.) Citation

Crossley, John N. What Is Mathematical Logic. London [etc.]: Oxford University Press, 1972.

MLA (9th ed.) Citation

Crossley, John N. What Is Mathematical Logic. Oxford University Press, 1972.

Warning: These citations may not always be 100% accurate.