Παραπομπή σε μορφή APA (7η εκδ.)

Gunatilake, H., & Gunaratne, L. L. (2002). Policy options for conserving Sri Lanka's natural forests. Economy and Environment Program for Southeast Asia.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Gunatilake, H.Mm, και Leslie L. Gunaratne. Policy Options for Conserving Sri Lanka's Natural Forests. Singapore: Economy and Environment Program for Southeast Asia, 2002.

Παραπομπή σε μορφή MLA (9th εκδ.)

Gunatilake, H.Mm, και Leslie L. Gunaratne. Policy Options for Conserving Sri Lanka's Natural Forests. Economy and Environment Program for Southeast Asia, 2002.