APA (7th ed.) Zitazioa
Lindgren, H. C. (1969). Readings in personal development. American Book Co..
Chicago Style (17th ed.) Zitazioa
Lindgren, Henry Clay. Readings in Personal Development. New York: American Book Co., 1969.
MLA (9th ed.) Zitazioa
Lindgren, Henry Clay. Readings in Personal Development. American Book Co., 1969.
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