Frey, D. G. (1974). A limnological reconnaisance of lake Lanao. University Research Center, Mindanao State University.
芝加哥风格引文Frey, David G. A Limnological Reconnaisance of Lake Lanao. Marawi City: University Research Center, Mindanao State University, 1974.
MLA引文Frey, David G. A Limnological Reconnaisance of Lake Lanao. University Research Center, Mindanao State University, 1974.
警告：这些引文格式不一定是100％准确.