APA
Thomas K., . (2009). Beginning Ubuntu Linux 4Ed (Pb). : Apress.
Chicago
Thomas K, . 2009. Beginning Ubuntu Linux 4Ed (Pb). : Apress.
Harvard
Thomas K., . (2009). Beginning Ubuntu Linux 4Ed (Pb). : Apress.
MLA
Thomas K, . Beginning Ubuntu Linux 4Ed (Pb). : Apress. 2009.