Cita APA (7th ed.)
Engstrom, T. W., & Larson, R. C. (1984). Motivation to last a lifetime. Zondervan Pub. House.
Cita Chicago (17th ed.)
Engstrom, Theodore Wilhelm, i Robert C. Larson. Motivation to Last a Lifetime. Grand Rapids, Mich.: Zondervan Pub. House, 1984.
Cita MLA (9th ed.)
Engstrom, Theodore Wilhelm, i Robert C. Larson. Motivation to Last a Lifetime. Zondervan Pub. House, 1984.
Atenció: Aquestes cites poden no estar 100% correctes.