Harkness, G. (1969). Stability amid change. Abingdon.
Lua i Stíl Chicago (17ú heag.)Harkness, Georgia. Stability Amid Change. Nashville: Abingdon, 1969.
Lua MLA (9ú heag.)Harkness, Georgia. Stability Amid Change. Abingdon, 1969.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.