Nuyda, D. G. (1999). A National policy for sustainable mining. IN Seeing green [column]. Philippine Daily Inquirer.
Citazione stile Chigago Style (17a edizione)Nuyda, Doris G. "A National Policy for Sustainable Mining. IN Seeing Green [column]." Philippine Daily Inquirer 1999.
Citatione MLA (9a ed.)Nuyda, Doris G. "A National Policy for Sustainable Mining. IN Seeing Green [column]." Philippine Daily Inquirer, 1999.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.