Harkness, G. (1969). Stability amid change. Abingdon.
Cita Chicago (17th ed.)Harkness, Georgia. Stability Amid Change. Nashville: Abingdon, 1969.
Cita MLA (9th ed.)Harkness, Georgia. Stability Amid Change. Abingdon, 1969.
Atenció: Aquestes cites poden no estar 100% correctes.