Orbeta, J., Orbeta, J. C. A., & Franco, B. V. J. (2001). Sec. Richard Gordon: 'Tourism is a sacred duty'. Kabayan.
Chicagoスタイル(17版)引用形式Orbeta, Joseph, Joseph Christian A. Orbeta, , Bernardo V. Jr Franco. "Sec. Richard Gordon: 'Tourism Is a Sacred Duty'." Kabayan 2001.
MLA(9版)引用形式Orbeta, Joseph, et al. "Sec. Richard Gordon: 'Tourism Is a Sacred Duty'." Kabayan, 2001.
警告: この引用は必ずしも正確ではありません.