Παραπομπή σε μορφή APA (7η εκδ.)

Environmental Center of the Philippines Foundation Incorporation & Department of Environment and Natural Resources. (1991). Manual for the preparation of an area ecological profile. [s.n.].

Παραπομπή σε μορφή Chicago (17η εκδ.)

Environmental Center of the Philippines Foundation Incorporation και Department of Environment and Natural Resources. Manual for the Preparation of an Area Ecological Profile. [s.l]: [s.n.], 1991.

Παραπομπή σε μορφή MLA (9th εκδ.)

Environmental Center of the Philippines Foundation Incorporation και Department of Environment and Natural Resources. Manual for the Preparation of an Area Ecological Profile. [s.n.], 1991.