Valdez, A. S., Sison, J. C., Mallari, F. D., & Cruz, M. D. P. (2001). Free versus fee-based for information access. Institute of Library Science, University of the Philippines Diliman.
芝加哥风格引文Valdez, Andriette S., Josephine C. Sison, Florenda D. Mallari, 与 Ma. Divina P. Cruz. Free Versus Fee-based for Information Access. Quezon City: Institute of Library Science, University of the Philippines Diliman, 2001.
MLA引文Valdez, Andriette S., et al. Free Versus Fee-based for Information Access. Institute of Library Science, University of the Philippines Diliman, 2001.
警告：这些引文格式不一定是100％准确.