- 16mm colour film taken by Christoph von Furer-Haimendorf in 1970
- manuscript - Christoph von Furer-Haimendorf Naga diary on his return to Nagaland, 1970
- typescript - J.H. Hutton tour diary in the Naga Hills
- typescript - J.P. Mills, tour diary, August 1928
- printed - tour diary of the Deputy Commissioner of the Naga Hills for the year 1870-1872 (John Butler) volume two
- published - extracts from 'Descriptive Ethnography of Bengal' on Nagas by E.T. Dalton