APA (7th ed.) Zitazioa
Griggs, D. L. (1977). 20 new ways of teaching the bible. GER.
Chicago Style (17th ed.) Zitazioa
Griggs, Donald L. 20 New Ways of Teaching the Bible. Nashville: GER, 1977.
MLA (9th ed.) Zitazioa
Griggs, Donald L. 20 New Ways of Teaching the Bible. GER, 1977.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.