Cita APA (7th ed.)

O'Leary, T. J. (1991). Computing essentials: Annual Edition 1991-1992. McGraw-Hill.

Cita Chicago (17th ed.)

O'Leary, Timothy J. Computing Essentials: Annual Edition 1991-1992. New York: McGraw-Hill, 1991.

Cita MLA (9th ed.)

O'Leary, Timothy J. Computing Essentials: Annual Edition 1991-1992. McGraw-Hill, 1991.