Richards, L. O. (1978). Sxity nine to start a study group and keep it growing. Zondervan.
Citazione stile Chigago Style (17a edizione)Richards, Lawrence O. Sxity Nine to Start a Study Group and Keep It Growing. Zondervan, 1978.
Citatione MLA (9a ed.)Richards, Lawrence O. Sxity Nine to Start a Study Group and Keep It Growing. Zondervan, 1978.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.