Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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