Introductory calculus for business and economics [by] William E. Beatty [and] R. William Gage. Beatty, William E. Gage, Ronald William, 1945- joint author. Economics, Mathematical. Calculus. HB135 .B4 515.4 BEI Morristown, N.J. : General Learning Press, 1973. 1973. 1973 Text 371 p. : eng