APA (7e ed.) Bronvermelding

Villegas, B. M. (1989). Improving the lines of 18m Filipinos. IN The Positive sum game [column]. Manila Chronicle.

Chicago (17e ed.) Bronvermelding

Villegas, Bernardo M. "Improving the Lines of 18m Filipinos. IN The Positive Sum Game [column]." Manila Chronicle 1989.

MLA (9e ed.) Bronvermelding

Villegas, Bernardo M. "Improving the Lines of 18m Filipinos. IN The Positive Sum Game [column]." Manila Chronicle, 1989.