Παραπομπή σε μορφή APA (7η εκδ.)

Roque, C. R. (1990). Environment and natural resources: Status and prospects. Economic Development Foundation.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Roque, Celso R. Environment and Natural Resources: Status and Prospects. [Makati City]: Economic Development Foundation, 1990.

Παραπομπή σε μορφή MLA (9th εκδ.)

Roque, Celso R. Environment and Natural Resources: Status and Prospects. Economic Development Foundation, 1990.