Dela Curz, P. A. (1999). Is it overpopulation or overconsumption. IN Commentary [column]. Philippine Daily Inquirer.
Chicago-viite (17. p.)Dela Curz, Pennie Azarcon. "Is It Overpopulation or Overconsumption. IN Commentary [column]." Philippine Daily Inquirer 1999.
MLA-viite (9. p.)Dela Curz, Pennie Azarcon. "Is It Overpopulation or Overconsumption. IN Commentary [column]." Philippine Daily Inquirer, 1999.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.