APA

,, . (1990). The quick reference guide for MS-DOS. New Delhi: BPB Publications.

Chicago

,, . 1990. The quick reference guide for MS-DOS. New Delhi: BPB Publications.

Harvard

,, . (1990). The quick reference guide for MS-DOS. New Delhi: BPB Publications.

MLA

,, . The quick reference guide for MS-DOS. New Delhi: BPB Publications. 1990.