Hefley, J. C. (1968). Peril by choice: The story of John and Elaine Beekman, Wycliffe Bible translators in Mexico (Special ed.). School of Tomorrow.
Παραπομπή σε μορφή Chicago (17η εκδ.)Hefley, James C. Peril by Choice: The Story of John and Elaine Beekman, Wycliffe Bible Translators in Mexico. Special ed. Lewisville, Texas: School of Tomorrow, 1968.
Παραπομπή σε μορφή MLA (8th εκδ.)Hefley, James C. Peril by Choice: The Story of John and Elaine Beekman, Wycliffe Bible Translators in Mexico. Special ed. School of Tomorrow, 1968.
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