Seng, O. G., Estavillo, C. C., & Nera, C. M. (1981). A survey of college and university libraries in Region I: Its implications to the Private Higher Education (PHE) Library Standards. Institute of Library Science, University of the Philippines Diliman.
Παραπομπή σε μορφή Chicago (17η εκδ.)Seng, Olga G., Corazon C. Estavillo, και Corazon M. Nera. A Survey of College and University Libraries in Region I: Its Implications to the Private Higher Education (PHE) Library Standards. Quezon City: Institute of Library Science, University of the Philippines Diliman, 1981.
Παραπομπή σε μορφή MLA (9th εκδ.)Seng, Olga G., et al. A Survey of College and University Libraries in Region I: Its Implications to the Private Higher Education (PHE) Library Standards. Institute of Library Science, University of the Philippines Diliman, 1981.