Gopez, C. A. A., & Tharayil, D. P. (2006). The relationship of extraversion and locus of control with the hardiness of 4th year college students of the university of the assumption in city of San Fernando, in the a.y. 2005-2006. University of the Philippines Diliman Extension Program in Pampanga.

Gopez, Catherine Ann A., and Davis P. Tharayil. The Relationship of Extraversion and Locus of Control with the Hardiness of 4th Year College Students of the University of the Assumption in City of San Fernando, in the A.y. 2005-2006. Pampanga: University of the Philippines Diliman Extension Program in Pampanga, 2006.

Gopez, Catherine Ann A., and Davis P. Tharayil. The Relationship of Extraversion and Locus of Control with the Hardiness of 4th Year College Students of the University of the Assumption in City of San Fernando, in the A.y. 2005-2006. University of the Philippines Diliman Extension Program in Pampanga, 2006.