APA (7th ed.) Citation

Littlewood, D. E. (1960). The skeleton key of mathematics: A simple account of complex algebraic theories. Harper & Row.

Chicago Style (17th ed.) Citation

Littlewood, Dudley Ernest. The Skeleton Key of Mathematics: A Simple Account of Complex Algebraic Theories. New York [etc.]: Harper & Row, 1960.

MLA (9th ed.) Citation

Littlewood, Dudley Ernest. The Skeleton Key of Mathematics: A Simple Account of Complex Algebraic Theories. Harper & Row, 1960.