Bentley, J. H., & Ziegler, H. F. (2009). Traditions and encounters: A global perspective on the past (4th ed.). McGraw-Hill.

Bentley, Jerry H., and Herbert F. Ziegler. Traditions and Encounters: A Global Perspective on the Past. 4th ed. Boston: McGraw-Hill, 2009.

Bentley, Jerry H., and Herbert F. Ziegler. Traditions and Encounters: A Global Perspective on the Past. 4th ed. McGraw-Hill, 2009.