APA (7th ed.) Zitazioa

Lewis, G. (1995). The power of a promise kept: Life stories. Focus on the Family Pub..

Chicago Style (17th ed.) Zitazioa

Lewis, Gregg. The Power of a Promise Kept: Life Stories. Colorado Springs, Colo.: Focus on the Family Pub., 1995.

MLA (9th ed.) Zitazioa

Lewis, Gregg. The Power of a Promise Kept: Life Stories. Focus on the Family Pub., 1995.