Referenced by:
- black & white photographs taken by Ursula Graham Bower between 1937 and 1946
- diaries kept by Ursula Graham Bower on visits to Manipur and North Cachar between 1937 and 1940
- miscellaneous papers, notebooks and letters on Nagas by Ursula Graham Bower, 1937-1947
- book - 'Naga Path', by Ursula Graham Bower, published John Murray 1950