Hobbs, J. J., & Salter, C. L. (2006). Essentials of world regional geography. Belmont, CA : Thomson Brools/Cole.
Cita Chicago (17th ed.)Hobbs, Joseph J., i Christopher L. Salter. Essentials of World Regional Geography. Belmont, CA : Thomson Brools/Cole, 2006.
Cita MLA (9th ed.)Hobbs, Joseph J., i Christopher L. Salter. Essentials of World Regional Geography. Belmont, CA : Thomson Brools/Cole, 2006.
Atenció: Aquestes cites poden no estar 100% correctes.