Richards, L. O. (1975). A theology of christian education. Zondervan.
Lua i Stíl Chicago (17ú heag.)Richards, Lawrence O. A Theology of Christian Education. Zondervan, 1975.
Lua MLA (9ú heag.)Richards, Lawrence O. A Theology of Christian Education. Zondervan, 1975.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.