APA (7 वां संस्करण) प्रशस्ति पत्र

Ng, P. Y. (2011). Household willingness to pay for mandated kerbside recycling programme in Hulu Langat, Malaysia.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Ng, Phuay Ying. Household Willingness to Pay for Mandated Kerbside Recycling Programme in Hulu Langat, Malaysia. 2011.

एमएलए (9वां संस्करण) प्रशस्ति पत्र

Ng, Phuay Ying. Household Willingness to Pay for Mandated Kerbside Recycling Programme in Hulu Langat, Malaysia. 2011.

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