Cita APA (7th ed.)
Helm, P. (1987). Objective knowledge: A christian perspective. Inter-varsity press.
Cita Chicago (17th ed.)
Helm, Paul. Objective Knowledge: A Christian Perspective. Leicester: Inter-varsity press, 1987.
Cita MLA (9th ed.)
Helm, Paul. Objective Knowledge: A Christian Perspective. Inter-varsity press, 1987.
Atenció: Aquestes cites poden no estar 100% correctes.