Nuyda, D. G. (1998). Healthy ecology, the basis for healthy economy. IN Seeing green [column]. Philippine Daily Inquirer.
Citace podle Chicago (17th ed.)Nuyda, Doris G. "Healthy Ecology, the Basis for Healthy Economy. IN Seeing Green [column]." Philippine Daily Inquirer 1998.
Citace podle MLA (9th ed.)Nuyda, Doris G. "Healthy Ecology, the Basis for Healthy Economy. IN Seeing Green [column]." Philippine Daily Inquirer, 1998.
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