APA aipamena

Gutiérrez, R. (1999). Protected wild areas and tourism competitiveness.

Chicago Style aipamena

Gutiérrez, Rafael. Protected Wild Areas and Tourism Competitiveness. 1999.

MLA aipamena

Gutiérrez, Rafael. Protected Wild Areas and Tourism Competitiveness. 1999.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.