(1999). May katwiran ang katwiran. Office of the Vice-Chancellor for Research and Development, Office of the Vice-Chancellor for Academic Affairs, Departamento ng Filipino at Panitikan ng Pilipinas, University of the Philippines, Diliman.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)May Katwiran Ang Katwiran. Quezon City: Office of the Vice-Chancellor for Research and Development, Office of the Vice-Chancellor for Academic Affairs, Departamento ng Filipino at Panitikan ng Pilipinas, University of the Philippines, Diliman, 1999.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)May Katwiran Ang Katwiran. Office of the Vice-Chancellor for Research and Development, Office of the Vice-Chancellor for Academic Affairs, Departamento ng Filipino at Panitikan ng Pilipinas, University of the Philippines, Diliman, 1999.