Llamas, C. (1999). We've seen the future and its ecotourism. Philippine Daily Inquirer.
Chicago-referens (17:e uppl.)Llamas, Cora. "We've Seen the Future and Its Ecotourism." Philippine Daily Inquirer 1999.
MLA-referens (9:e uppl.)Llamas, Cora. "We've Seen the Future and Its Ecotourism." Philippine Daily Inquirer, 1999.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.