APA (7e ed.) Bronvermelding

Tourist Research & Planning T.R.P.Ltd Zug Switzerland. (1978). Manila portfolio. Tourist Research & planning T.R.P.Ltd Zug.

Chicago (17e ed.) Bronvermelding

Tourist Research & Planning T.R.P.Ltd Zug Switzerland. Manila Portfolio. [Switzerland]: Tourist Research & planning T.R.P.Ltd Zug, 1978.

MLA (9e ed.) Bronvermelding

Tourist Research & Planning T.R.P.Ltd Zug Switzerland. Manila Portfolio. Tourist Research & planning T.R.P.Ltd Zug, 1978.

Let op: Deze citaties zijn niet altijd 100% accuraat.