OJAKANGAS, R. W. (1976). The earth, past and present - Richard W. Ojakangas, David G. Darby. McGraw-Hill.
Chicago Style (17th ed.) CitationOJAKANGAS, Richard W. The Earth, Past and Present - Richard W. Ojakangas, David G. Darby. McGraw-Hill, 1976.
MLA (8th ed.) CitationOJAKANGAS, Richard W. The Earth, Past and Present - Richard W. Ojakangas, David G. Darby. McGraw-Hill, 1976.
Warning: These citations may not always be 100% accurate.