Zaragoza:

BB	1. Unix and Linux system administration handbook / Evi Nemeth ... [et al.] ; with Terry Morreale ... [et al.] . 4th ed. Upper Saddle River (New Jersey) : Prentice Hall, 2011
BB	2. Frisch, Aeleen. Essential system administration / Aeleen Frisch . 3rd ed. rev. and upd. Beijing [etc.] : O'Reilly, 2002
BB	3. Kochan, Stephen G.. Unix : shell programming / Stephen G. Kochan and Patrick H. Wood . - 3rd ed., 1st pr. Indianapolis, Indiana : Sams, 2003

Teruel:

BB	Frisch, Aeleen. Essential system administration / Aeleen Frisch . - 3rd ed. rev. and upd. Beijing [etc.] : O'Reilly, 2002
BB	Kochan, Stephen G.. Unix : shell programming / Stephen G. Kochan and Patrick H. Wood . - 3rd ed., 1st pr. Indianapolis, Indiana : Sams, 2003
BB	Unix and Linux system administration handbook / Evi Nemeth ... [et al.] ; with Terry Morreale ... [et al.] . - 4th ed. Upper Saddle River (New Jersey) : Prentice Hall, 2011