Tullao, T. S., & Cortez, M. A. (2005). Issues and prospects on the movement of natural persons and human capital development in the Philippine-American economic relations. Center for Business and Economics Research and Development.

Tullao, Tereso S., and Michael Angelo Cortez. Issues and Prospects on the Movement of Natural Persons and Human Capital Development in the Philippine-American Economic Relations. Manila: Center for Business and Economics Research and Development, 2005.

Tullao, Tereso S., and Michael Angelo Cortez. Issues and Prospects on the Movement of Natural Persons and Human Capital Development in the Philippine-American Economic Relations. Center for Business and Economics Research and Development, 2005.