Gaya APA

Richards, L, O. (-1978). 69 (Sixty nine) ways to start a study group and keep it growing, (7th pr) Cet.pertama 1973. . Grand Rapids: Zondervan.

Gaya MLA

Richards, Lawrence, O.. "69 (Sixty nine) ways to start a study group and keep it growing, (7th pr) Cet.pertama 1973. ". Grand Rapids: Zondervan, -1978. Buku.