Cita APA (7th ed.)

(1989). Social weather bulletin: 1990 series. Social Weather Stations, Inc.

Cita Chicago (17th ed.)

Social Weather Bulletin: 1990 Series. Quezon city: Social Weather Stations, Inc, 1989.

Cita MLA (9th ed.)

Social Weather Bulletin: 1990 Series. Social Weather Stations, Inc, 1989.