Prill-Brett, J. P. (1987). Pechen: The Bontok peace pact institution. Cordillera Studies Center, University of the Philippines Baguio.
Chicago-viite (17. p.)Prill-Brett, June P. Pechen: The Bontok Peace Pact Institution. Baguio City: Cordillera Studies Center, University of the Philippines Baguio, 1987.
MLA-viite (9. p.)Prill-Brett, June P. Pechen: The Bontok Peace Pact Institution. Cordillera Studies Center, University of the Philippines Baguio, 1987.
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