APA (7e ed.) Bronvermelding

Percy, J. O., & Bennett, M. D. (1961). facing The Unfinished Task: Messages delivered at the congress on world missions (ed.). Zondervan.

Chicago (17e ed.) Bronvermelding

Percy, J. O., en Mary Dr Bennett. Facing The Unfinished Task: Messages Delivered at the Congress on World Missions. ed. Michigan: Zondervan, 1961.

MLA (9e ed.) Bronvermelding

Percy, J. O., en Mary Dr Bennett. Facing The Unfinished Task: Messages Delivered at the Congress on World Missions. ed. Zondervan, 1961.