APA (7th ed.) Citation

O'Brien. (1989). PC Software Workbook: The PC and DOS,PC-Write,tm,PC-CALC+,tmPC-File+tm. IRWIN.

Chicago Style (17th ed.) Citation

O'Brien. PC Software Workbook: The PC and DOS,PC-Write,tm,PC-CALC+,tmPC-File+tm. IRWIN, 1989.

MLA (8th ed.) Citation

O'Brien. PC Software Workbook: The PC and DOS,PC-Write,tm,PC-CALC+,tmPC-File+tm. IRWIN, 1989.

Warning: These citations may not always be 100% accurate.