Tipan, E. Greener measures in auto manufacturing. Manila Bulletin.
Cita Chicago (17th ed.)Tipan, Eric. "Greener Measures in Auto Manufacturing." Manila Bulletin .
Cita MLA (9th ed.)Tipan, Eric. "Greener Measures in Auto Manufacturing." Manila Bulletin, .
Atenció: Aquestes cites poden no estar 100% correctes.