Cita APA (7th ed.)
Hubbard, D. A. (1972). The problem with prayer is... Tyndale.
Cita Chicago (17th ed.)
Hubbard, David A. The Problem with Prayer Is... Wheaton: Tyndale, 1972.
Cita MLA (9th ed.)
Hubbard, David A. The Problem with Prayer Is... Tyndale, 1972.
Atenció: Aquestes cites poden no estar 100% correctes.