APA-referens (7:e uppl.)
Willmott, H. M. J. The doors were opened: The remarkable advance of the gospel in Ethiopia. Sudan Interior Mission.
Chicago-referens (17:e uppl.)
Willmott, Helen Mary Jeffrey. The Doors Were Opened: The Remarkable Advance of the Gospel in Ethiopia. London: Sudan Interior Mission.
MLA-referens (9:e uppl.)
Willmott, Helen Mary Jeffrey. The Doors Were Opened: The Remarkable Advance of the Gospel in Ethiopia. Sudan Interior Mission.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.