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.