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Dalisay, Grace H. Aguiling, Jay A. Yacat, and Atoy M. Navarro. Extending the Self: Volunteering as Pakikipagkapwa. Quezon City: Center for Leadership, Citizenship and Democracy, National College of Public Administration and Governance, University of the Philippines, 2004.

Dalisay, Grace H. Aguiling, et al. Extending the Self: Volunteering as Pakikipagkapwa. Center for Leadership, Citizenship and Democracy, National College of Public Administration and Governance, University of the Philippines, 2004.