Learning the bash shell - UNIX shell programming (2. ed.). - Cameron Newham (O'Reilly, 1998)

Learning the bash shell - Unix shell programming: covers bash 3.0 (3 ed.). - Cameron Newham; Bill Rosenblatt (O'Reilly, 2005)

Bash cookbook - solutions and examples for bash users. - Carl Albing; J. P. Vossen; Cameron Newham (O'Reilly, 2007)