Williams, B. The Economic Importance of Non-Motorized Transport and its Impacts on Traffic Congestion Management. Philippine planning journal.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWilliams, Brian. "The Economic Importance of Non-Motorized Transport and Its Impacts on Traffic Congestion Management." Philippine Planning Journal .
एमएलए (9वां संस्करण) प्रशस्ति पत्रWilliams, Brian. "The Economic Importance of Non-Motorized Transport and Its Impacts on Traffic Congestion Management." Philippine Planning Journal, .
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