APA (7th ed.) Zitazioa
Lutzer, E. W. (1975). Failure, the back door to success. Moody.
Chicago Style (17th ed.) Zitazioa
Lutzer, Erwin W. Failure, the Back Door to Success. Chicago: Moody, 1975.
MLA (9th ed.) Zitazioa
Lutzer, Erwin W. Failure, the Back Door to Success. Moody, 1975.
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