Howard, R. (1980). Christian maturity. Cowman Publications,Inc..
Cita Chicago (17th ed.)Howard, Rick. Christian Maturity. Los Angeles 38: Cowman Publications,Inc., 1980.
Cita MLA (9th ed.)Howard, Rick. Christian Maturity. Cowman Publications,Inc., 1980.
Atenció: Aquestes cites poden no estar 100% correctes.