Pratt, Philip J. Advanced dBASE IV programming / Philip J. Pratt, Mary Z. Last. - Danvers, MA : Boyd & Fraser, c1994. - xviii, 554 p. : ill. (some col.) + 1 computer disk (3 1/2 in.) System requirements for computer disk: IBM-compatible PC; DOS; dBASE IV. ISBN: 0878359583 Subjects--Uniform Titles: dBASE IV (Computer file) Subjects--Topical Terms: Database management.