Senga, K. G. A., & Lapuz, E. B. (2013). User statistics of the UP Diliman General Reference and Electronic Resources Section, University Library: A multivariate trend analysis, 2005-2011. School of Library and Information Studies, University of the Philippines Diliman.

Senga, Karlo Gabriel A., and Elvira B. Lapuz. User Statistics of the UP Diliman General Reference and Electronic Resources Section, University Library: A Multivariate Trend Analysis, 2005-2011. Quezon City: School of Library and Information Studies, University of the Philippines Diliman, 2013.

Senga, Karlo Gabriel A., and Elvira B. Lapuz. User Statistics of the UP Diliman General Reference and Electronic Resources Section, University Library: A Multivariate Trend Analysis, 2005-2011. School of Library and Information Studies, University of the Philippines Diliman, 2013.