APA-čujuhus (7. p.)
Heydt, H. J. (1967). A comparison of world religions. Christian Literature Crusade.
Chicago-čujuhus (17. p.)
Heydt, Henry J. A Comparison of World Religions. Fort Washington: Christian Literature Crusade, 1967.
MLA-čujuhus (9. p.)
Heydt, Henry J. A Comparison of World Religions. Christian Literature Crusade, 1967.
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