Tourist Research & Planning T.R.P.Ltd Zug Switzerland. (1978). Manila portfolio. Tourist Research & planning T.R.P.Ltd Zug.
Cita Chicago (17th ed.)Tourist Research & Planning T.R.P.Ltd Zug Switzerland. Manila Portfolio. [Switzerland]: Tourist Research & planning T.R.P.Ltd Zug, 1978.
Cita MLA (9th ed.)Tourist Research & Planning T.R.P.Ltd Zug Switzerland. Manila Portfolio. Tourist Research & planning T.R.P.Ltd Zug, 1978.
Atenció: Aquestes cites poden no estar 100% correctes.