1. A.J. Hall-Martin, "South African Journal of Science." 83, "The role of musth in the reproductive strategy of the African elephant (Loxodonta africana)." 616 (1987)
2. R.M. Laws, "East African Wildlife Journal." 4, "Age criteria for the African elephant (Loxodonta africana)." 1 (1966)
3. R.M. Laws, "Large Animals and Wide Horizons: the Autobiography of Richard M. Laws." (2017)
4. I.S.C. Parker, "The Ivory Trade." (1979)
5. E. Abe, "Pachyderm." 22, "Tusklessness among the Queen Elizabeth National Park Elephants, Uganda." 47 (1996)