Hoff and Overgaard & World Tourism Organization. (1992). Tourism master plan for the Philippines. World Tourism Organization.
芝加哥风格引文Hoff and Overgaard 与 World Tourism Organization. Tourism Master Plan for the Philippines. [Madridn]: World Tourism Organization, 1992.
MLA引文Hoff and Overgaard 与 World Tourism Organization. Tourism Master Plan for the Philippines. World Tourism Organization, 1992.
警告：这些引文格式不一定是100％准确.