Ubuntu Ducumentation Project. (2011). Ubuntu 11.04: Ubuntu classic desktop guide. Fultus.
芝加哥风格引文Ubuntu Ducumentation Project. Ubuntu 11.04: Ubuntu Classic Desktop Guide. Palo Alto, Calif.: Fultus, 2011.
MLA引文Ubuntu Ducumentation Project. Ubuntu 11.04: Ubuntu Classic Desktop Guide. Fultus, 2011.
警告：这些引文格式不一定是100％准确.