Nathan Associates, Inc. (1990). Philippine transport sector review. Nathan Associates.
Cita Chicago (17th ed.)Nathan Associates, Inc. Philippine Transport Sector Review. Washington, D.C: Nathan Associates, 1990.
Cita MLA (9th ed.)Nathan Associates, Inc. Philippine Transport Sector Review. Nathan Associates, 1990.
Atenció: Aquestes cites poden no estar 100% correctes.