Cita APA (7th ed.)
O'brien, J. A. (1989). PC Software Workbook (2nd ed.). Irwin.
Cita Chicago (17th ed.)
O'brien, James A. PC Software Workbook. 2nd ed. Boston: Irwin, 1989.
Cita MLA (9th ed.)
O'brien, James A. PC Software Workbook. 2nd ed. Irwin, 1989.
Atenció: Aquestes cites poden no estar 100% correctes.