Raum, O. F., Mumford, W. B., & International African Institute. (1940). Chaga childhood: A description of indigenous education in an East African tribe. Pub. for the International institute of African languages & cultures by the Oxford university press.

Raum, Otto Friedrich., et al. Chaga Childhood: A Description of Indigenous Education in an East African Tribe. Pub. for the International institute of African languages & cultures by the Oxford university press, 1940.