@book{441,
	author = {Simpson, Alan, and Simpson, Alan,},
	title = {Understanding dBASE IV 1.5 for DOS /},
	publisher = {Sybex,},
	year = {c1992.},
	address = {San Francisco :},
	edition = {3rd ed.},
	note = {Rev. ed. of: Understanding dBase IV 1.1. 2nd ed. c1989.}
}