Cita APA (7a ed.)

Walsh. Michael J. (1989). The secret world of opus dei. Grafton Books.

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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