Παραπομπή σε μορφή APA (7η εκδ.)

Philippines. Office of the President. Presidential Management Staff. (1987). Ethnolinguistic groups in the Cordilleras (SIC). [publisher not identified].

Παραπομπή σε μορφή Chicago (17η εκδ.)

Philippines. Office of the President. Presidential Management Staff. Ethnolinguistic Groups in the Cordilleras (SIC). [Place of publication not identified]: [publisher not identified], 1987.

Παραπομπή σε μορφή MLA (9th εκδ.)

Philippines. Office of the President. Presidential Management Staff. Ethnolinguistic Groups in the Cordilleras (SIC). [publisher not identified], 1987.