APA (7th ed.) Zitazioa
Collins, G. R. (1992). You can make a difference: 14 principles for influencing lives. Zondervan.
Chicago Style (17th ed.) Zitazioa
Collins, Gary R. You Can Make a Difference: 14 Principles for Influencing Lives. Grand Rapids, Mich.: Zondervan, 1992.
MLA (9th ed.) Zitazioa
Collins, Gary R. You Can Make a Difference: 14 Principles for Influencing Lives. Zondervan, 1992.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.