APA (7th ed.) Citation

Symonds, R. W. (1950). A book of English clocks (Rev. ed.). Penguin Books.

Chicago Style (17th ed.) Citation

Symonds, R. W. A Book of English Clocks. Rev. ed. London: Penguin Books, 1950.

MLA (9th ed.) Citation

Symonds, R. W. A Book of English Clocks. Rev. ed. Penguin Books, 1950.