Cita APA (7th ed.)
Peale, N. V. The Guideposts Anthology. Prentice-Hall : Guideposts Associates.
Cita Chicago (17th ed.)
Peale, Norman Vincent. The Guideposts Anthology. Nueva York, EUA: Prentice-Hall : Guideposts Associates.
Cita MLA (9th ed.)
Peale, Norman Vincent. The Guideposts Anthology. Prentice-Hall : Guideposts Associates.
Atenció: Aquestes cites poden no estar 100% correctes.