APA-čujuhus (7. p.)
Grubb, N. P. (1946). With C. T. Studd in Congo forests. Zondervan Pub. House.
Chicago-čujuhus (17. p.)
Grubb, Norman P. With C. T. Studd in Congo Forests. Grand Rapids: Zondervan Pub. House, 1946.
MLA-čujuhus (9. p.)
Grubb, Norman P. With C. T. Studd in Congo Forests. Zondervan Pub. House, 1946.
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