APA (7th ed.) Citation

Knox, R. A. (1961). The three taps: A detective story without a moral. Penguin books.

Chicago Style (17th ed.) Citation

Knox, Ronald Arbuthnott. The Three Taps: A Detective Story Without a Moral. Harmondsworth: Penguin books, 1961.

MLA (9th ed.) Citation

Knox, Ronald Arbuthnott. The Three Taps: A Detective Story Without a Moral. Penguin books, 1961.

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