APA (7. basım) Alıntı

Sager, R. J., & Helgren, D. M. (2000). Holt World geography today (Revised edition.). HoltRinehart and WinstonInc.

Chicago Style (17. basım) Atıf

Sager, Robert J., ve D. M. Helgren. Holt World Geography Today. Revised edition. Orlando: HoltRinehart and WinstonInc, 2000.

MLA (9th ed.) Atıf

Sager, Robert J., ve D. M. Helgren. Holt World Geography Today. Revised edition. HoltRinehart and WinstonInc, 2000.