Richards, L. O. (1972). Youth ministry. Zondervan.
Lua i Stíl Chicago (17ú heag.)Richards, Lawrence O. Youth Ministry. Grand Rapids: Zondervan, 1972.
Lua MLA (9ú heag.)Richards, Lawrence O. Youth Ministry. Zondervan, 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.