APA-referens (7:e uppl.)

Delfin, F. G., Jr. (2001). The national wealth tax on indigenous energy resources: Policy framework and implementation. Philippine Journal of Public Administration.

Chicago-referens (17:e uppl.)

Delfin, Francisco G., Jr. "The National Wealth Tax on Indigenous Energy Resources: Policy Framework and Implementation." Philippine Journal of Public Administration 2001.

MLA-referens (9:e uppl.)

Delfin, Francisco G., Jr. "The National Wealth Tax on Indigenous Energy Resources: Policy Framework and Implementation." Philippine Journal of Public Administration, 2001.