Witkin, J. Making businesses greener and leaner. Manila bulletin.
Cita Chicago (17th ed.)Witkin, Jim. "Making Businesses Greener and Leaner." Manila Bulletin .
Cita MLA (9th ed.)Witkin, Jim. "Making Businesses Greener and Leaner." Manila Bulletin, .
Atenció: Aquestes cites poden no estar 100% correctes.