Cita APA (7th ed.)
Hybels, b. (2002). Courageous leadership. Grand Rapids.
Cita Chicago (17th ed.)
Hybels, bill. Courageous Leadership. Zondervan: Grand Rapids, 2002.
Cita MLA (9th ed.)
Hybels, bill. Courageous Leadership. Grand Rapids, 2002.
Atenció: Aquestes cites poden no estar 100% correctes.