APA Style
Sobell, M, G., Helmke, M. (2018).
A practical guide to linux commands, editors, and shell programming (4th ed.).
mau:
Addison-Wesley.
MLA Style
Sobell, Mark, G.., Helmke, Matthew.
"A practical guide to linux commands, editors, and shell programming".
4th ed.
mau:
Addison-Wesley,
2018.
PDF.