APA (7th ed.) Citation

Walsh, M. J. (1989). The secret world of Opus Dei. Grafton Books.

Chicago Style (17th ed.) Citation

Walsh, Michael J. The Secret World of Opus Dei. London u.a: Grafton Books, 1989.

MLA (9th ed.) Citation

Walsh, Michael J. The Secret World of Opus Dei. Grafton Books, 1989.