Yap, R. C. (2004). Greening the market. IN Commentary [column]. Philippine Daily Inquirer.
Chicago-viite (17. p.)Yap, Roberto C. "Greening the Market. IN Commentary [column]." Philippine Daily Inquirer 2004.
MLA-viite (9. p.)Yap, Roberto C. "Greening the Market. IN Commentary [column]." Philippine Daily Inquirer, 2004.
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