Gaya APA

(IDM), I, B, M, C. (1987). Disk Operating Systems 3.30 DOS (Ed. 1). United Kingdom, UK: International Business machines Corporation.

Gaya MLA

(IDM), International, Business, Machines, Corporation. "Disk Operating Systems 3.30 DOS". Ed. 1 United Kingdom, UK: International Business machines Corporation, 1987. Text.