Gaya APA

Hudson, M, H, W, A, H, A, P. (2020). Ubuntu Linux Unleashed 2021 Edition (14th edition). : Addison-Wesley Professional.

Gaya MLA

Hudson, Matthew, Helmke,, With, Andrew, Hudson, And, Paul. "Ubuntu Linux Unleashed 2021 Edition". 14th edition : Addison-Wesley Professional, 2020. Text.