Steffensen, J. F. (1950). Interpolation (2nd ed.). Chelsea Pub. Co..
Chicago Style (17th ed.) CitationSteffensen, J. F. Interpolation. 2nd ed. New York: Chelsea Pub. Co., 1950.
MLA (8th ed.) CitationSteffensen, J. F. Interpolation. 2nd ed. Chelsea Pub. Co., 1950.
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