APA

Norton P., . (1993). Peter Norton's DOS 6 guide. New York: Brady Pub.

Chicago

Norton Peter, . 1993. Peter Norton's DOS 6 guide. New York: Brady Pub.

Harvard

Norton P., . (1993). Peter Norton's DOS 6 guide. New York: Brady Pub.

MLA

Norton Peter, . Peter Norton's DOS 6 guide. New York: Brady Pub. 1993.