SIMPSON (Alan), . (1987). Dbase iii plus Programmers Refrence Guide. : San fransico, sybex.
SIMPSON (Alan), . 1987. Dbase iii plus Programmers Refrence Guide. : San fransico, sybex.
SIMPSON (Alan), . Dbase iii plus Programmers Refrence Guide. : San fransico, sybex. 1987.
