Gannon, M. G. (1990). The Philippines tourism manpower survey, 1990.
芝加哥风格引文Gannon, Mary G. The Philippines Tourism Manpower Survey, 1990. [S.l., s.n.], 1990.
MLA引文Gannon, Mary G. The Philippines Tourism Manpower Survey, 1990. 1990.
警告：这些引文格式不一定是100％准确.