Philippines. Department of Tourism. (1998). Towards a greener globe. DOT/UNDP/DENR.
Chicago Style aipamenaPhilippines. Department of Tourism. Towards a Greener Globe. [S.l.]: DOT/UNDP/DENR, 1998.
MLA aipamenaPhilippines. Department of Tourism. Towards a Greener Globe. DOT/UNDP/DENR, 1998.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.