Sabater, M. R. (2007). 22 buses fueled by natural gas now ready for use. Manila Bulletin.
Chicago Style (17. basım) AtıfSabater, Madel R. "22 Buses Fueled by Natural Gas Now Ready for Use." Manila Bulletin 2007.
MLA (9th ed.) AtıfSabater, Madel R. "22 Buses Fueled by Natural Gas Now Ready for Use." Manila Bulletin, 2007.
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