(古罗马)西塞罗(MarcusTulliusCicero)著. (2007). 西塞罗三论：论友谊·论老年·论责任：英中文双语读本. 团结出版社.
Chicago Style (17th ed.) Citation(古罗马)西塞罗(MarcusTulliusCicero)著. 西塞罗三论：论友谊·论老年·论责任：英中文双语读本. 团结出版社, 2007.
MLA (8th ed.) Citation(古罗马)西塞罗(MarcusTulliusCicero)著. 西塞罗三论：论友谊·论老年·论责任：英中文双语读本. 团结出版社, 2007.
Warning: These citations may not always be 100% accurate.