Cita APA (7th ed.)
Hallesby, O., & Carlsen, C. J. (1959). Prayer. Augsburg publishing house.
Cita Chicago (17th ed.)
Hallesby, Ole, i Clarence Johannes Carlsen. Prayer. Minneapolis, Minn.: Augsburg publishing house, 1959.
Cita MLA (9th ed.)
Hallesby, Ole, i Clarence Johannes Carlsen. Prayer. Augsburg publishing house, 1959.
Atenció: Aquestes cites poden no estar 100% correctes.