Hill, B. M. (2011). The official ubuntu book (6th ed.). Prentice Hall.
Dyfyniad Arddull ChicagoHill, Benjamin Mako. The Official Ubuntu Book. 6th ed. Upper Saddle River, NJ: Prentice Hall, 2011.
Dyfyniad MLAHill, Benjamin Mako. The Official Ubuntu Book. 6th ed. Prentice Hall, 2011.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.