Salvador, M. R. (2012). Measuring the efficiency of selected travel agencies in Metro Manila: A frontier approach [thesis abstract]. Ad Veritatem.
Chicago-referens (17:e uppl.)Salvador, Magnolia Rafael. "Measuring the Efficiency of Selected Travel Agencies in Metro Manila: A Frontier Approach [thesis Abstract]." Ad Veritatem 2012.
MLA-referens (9:e uppl.)Salvador, Magnolia Rafael. "Measuring the Efficiency of Selected Travel Agencies in Metro Manila: A Frontier Approach [thesis Abstract]." Ad Veritatem, 2012.
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