APA استشهاد

Key,, L. (2007). RHCE red hat certified engineer linux. Dreamtech.

استشهاد بنمط شيكاغو

Key,, Learn. RHCE Red Hat Certified Engineer Linux. New Delhi: Dreamtech, 2007.

MLA استشهاد

Key,, Learn. RHCE Red Hat Certified Engineer Linux. Dreamtech, 2007.