Cita APA (7a ed.)

Sin autor & International Business Machines Corporation - IBM. (1972). OS advanced checkpoint/restart: Release 21 (5th ed.). [S.n.].

Cita Chicago Style (17a ed.)

Sin autor y International Business Machines Corporation - IBM. OS Advanced Checkpoint/restart: Release 21. 5th ed. San Jose: [S.n.], 1972.

Cita MLA (9a ed.)

Sin autor y International Business Machines Corporation - IBM. OS Advanced Checkpoint/restart: Release 21. 5th ed. [S.n.], 1972.