OJAKANGAS, R. W. (1991). Theory and problems of introductory geology. McGraw Hill.
芝加哥风格引文OJAKANGAS, Richard W. Theory and Problems of Introductory Geology. New York: McGraw Hill, 1991.
MLA引文OJAKANGAS, Richard W. Theory and Problems of Introductory Geology. McGraw Hill, 1991.
警告：这些引文格式不一定是100％准确.