Robertson, P. (1938). Some problems of the middle Mississippi River region during Pleistocene time.
Chicago Style (17th ed.) CitationRobertson, Percival. Some Problems of the Middle Mississippi River Region During Pleistocene Time. St. Louis, 1938.
MLA (9th ed.) CitationRobertson, Percival. Some Problems of the Middle Mississippi River Region During Pleistocene Time. 1938.
Warning: These citations may not always be 100% accurate.