Agra, A. C. (1997). A Q & A primer on the Philippine party-list system: A list proportional representation scheme of electing one-fifth of the members of the House of Representatives. Rex Book Store.
Chicago-referens (17:e uppl.)Agra, Alberto C. A Q & A Primer on the Philippine Party-list System: A List Proportional Representation Scheme of Electing One-fifth of the Members of the House of Representatives. Manila: Rex Book Store, 1997.
MLA-referens (8:e uppl.)Agra, Alberto C. A Q & A Primer on the Philippine Party-list System: A List Proportional Representation Scheme of Electing One-fifth of the Members of the House of Representatives. Rex Book Store, 1997.
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