Brett, J. P., Cruz, G. A., Mendoza, L. C., & Tapang, B. P. (1994). A comparative study of agricultural commercialization in selected highland communities of the Cordillera-Ilocos Region. Cordillera Studies Center, University of the Philippines College Baguio.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Brett, June Prill, Gladys A. Cruz, Lorelei Crisologo Mendoza, و Bienvenido P. Tapang. A Comparative Study of Agricultural Commercialization in Selected Highland Communities of the Cordillera-Ilocos Region. Baguio City: Cordillera Studies Center, University of the Philippines College Baguio, 1994.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Brett, June Prill, et al. A Comparative Study of Agricultural Commercialization in Selected Highland Communities of the Cordillera-Ilocos Region. Cordillera Studies Center, University of the Philippines College Baguio, 1994.