Olford, S. F. (1963). The secret of soul-winning. Moody Press.
Cita Chicago (17th ed.)Olford, Stephen F. The Secret of Soul-winning. Moody Press, 1963.
Cita MLA (9th ed.)Olford, Stephen F. The Secret of Soul-winning. Moody Press, 1963.
Atenció: Aquestes cites poden no estar 100% correctes.