Diaz, V. L. C., Salinas, J. T. I., & Colongon, A. A. J. (1989). Assessment of secondary materials on the provinces of Ifugao, Mountain Province and Nueva Vizcaya, 1978-1989. Cordillera Studies Center, University of the Philippines Baguio.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Diaz, Victoria Lourdes C., Jorge T. II Salinas, و Arellano A. Jr Colongon. Assessment of Secondary Materials on the Provinces of Ifugao, Mountain Province and Nueva Vizcaya, 1978-1989. Baguio City: Cordillera Studies Center, University of the Philippines Baguio, 1989.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Diaz, Victoria Lourdes C., et al. Assessment of Secondary Materials on the Provinces of Ifugao, Mountain Province and Nueva Vizcaya, 1978-1989. Cordillera Studies Center, University of the Philippines Baguio, 1989.