Cita APA (7th ed.)

Perry, W. E. (1981). Managing systems maintenance. Q.E.D. Information Sciences.

Cita Chicago (17th ed.)

Perry, William E. Managing Systems Maintenance. Wellesley, MA.: Q.E.D. Information Sciences, 1981.

Cita MLA (8th ed.)

Perry, William E. Managing Systems Maintenance. Q.E.D. Information Sciences, 1981.