APA-referens (7:e uppl.)

Abila, E. (1976). Strategic intelligence in the foreign service [microform]. Photoduplication Service University of the Philippines Library.

Chicago-referens (17:e uppl.)

Abila, Enrique. Strategic Intelligence in the Foreign Service [microform]. Quezon City: Photoduplication Service University of the Philippines Library, 1976.

MLA-referens (9:e uppl.)

Abila, Enrique. Strategic Intelligence in the Foreign Service [microform]. Photoduplication Service University of the Philippines Library, 1976.