Dela Curz, P. A. (1999). Is it overpopulation or overconsumption. IN Commentary [column]. Philippine Daily Inquirer.
Chicago-referens (17:e uppl.)Dela Curz, Pennie Azarcon. "Is It Overpopulation or Overconsumption. IN Commentary [column]." Philippine Daily Inquirer 1999.
MLA-referens (9:e uppl.)Dela Curz, Pennie Azarcon. "Is It Overpopulation or Overconsumption. IN Commentary [column]." Philippine Daily Inquirer, 1999.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.