APA استشهاد

Heck, H. (1993). UNIX: Working with UNIX and XENIX. Prisma computer courses.

استشهاد بنمط شيكاغو

Heck, Hans-Josef. UNIX: Working with UNIX and XENIX. Great Britain: Prisma computer courses, 1993.

MLA استشهاد

Heck, Hans-Josef. UNIX: Working with UNIX and XENIX. Prisma computer courses, 1993.