Tuttle, Brendan (2019). "A trip to the zoo: colonial sightseeing and spectacle in Sudan (1901–1933)". Journal of Tourism History. 11 (3): 217–242. doi:10.1080/1755182X.2019.1642962. S2CID202279729.
Tuttle, Brendan (2019). "A trip to the zoo: colonial sightseeing and spectacle in Sudan (1901–1933)". Journal of Tourism History. 11 (3): 217–242. doi:10.1080/1755182X.2019.1642962. S2CID202279729.