Orbeta, J., Orbeta, J. C. A., & Franco, B. V. J. (2001). Sec. Richard Gordon: 'Tourism is a sacred duty'. Kabayan.
Chicago Style (17. basım) AtıfOrbeta, Joseph, Joseph Christian A. Orbeta, ve Bernardo V. Jr Franco. "Sec. Richard Gordon: 'Tourism Is a Sacred Duty'." Kabayan 2001.
MLA (9th ed.) AtıfOrbeta, Joseph, et al. "Sec. Richard Gordon: 'Tourism Is a Sacred Duty'." Kabayan, 2001.
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