APA aipamena

Villanueva, P. M. (1989). English skills for college freshmen. Katha Pub.

Chicago Style aipamena

Villanueva, Perla M. English Skills for College Freshmen. Quezon City: Katha Pub, 1989.

MLA aipamena

Villanueva, Perla M. English Skills for College Freshmen. Katha Pub, 1989.