The Hipag are ferocious spirit of war who are invoked by warring expeditions to provide courage. They are also invoked in kinship controversies and in sorcery.
- Barton, Roy Franklin. (1946). "The Religion of the Ifugaos." MAAA no. 65, pp. 74, 75.
- Jocano, F. Landa. (1969). Outline of Philippine Mythology. Manila: Centro Escolar University Research and Development Center, p. 18.