APA-čujuhus (7. p.)
Hubbard, D. A. (1972). The problem with prayer is... Tyndale.
Chicago-čujuhus (17. p.)
Hubbard, David A. The Problem with Prayer Is... Wheaton: Tyndale, 1972.
MLA-čujuhus (9. p.)
Hubbard, David A. The Problem with Prayer Is... Tyndale, 1972.
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