Παραπομπή σε μορφή APA (7η εκδ.)

Springer, J. M. (1909). The heart of central Africa: Mineral wealth and missionary opportunity. Methodist Book Concern.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Springer, John McKendree. The Heart of Central Africa: Mineral Wealth and Missionary Opportunity. New York: Methodist Book Concern, 1909.

Παραπομπή σε μορφή MLA (8th εκδ.)

Springer, John McKendree. The Heart of Central Africa: Mineral Wealth and Missionary Opportunity. Methodist Book Concern, 1909.