Serrano, I. R., & Bello, W. F. (1994). Pay now, not later: Essays on environment and development. Philippine Rural Reconstruction Movement.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSerrano, Isagani R., और Walden F. Bello. Pay Now, Not Later: Essays on Environment and Development. Quezon City: Philippine Rural Reconstruction Movement, 1994.
एमएलए (9वां संस्करण) प्रशस्ति पत्रSerrano, Isagani R., और Walden F. Bello. Pay Now, Not Later: Essays on Environment and Development. Philippine Rural Reconstruction Movement, 1994.
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