Bentley, J. H., & Ziegler, H. F. (2003). Traditions & encounters: A global perspective on the past (Second edition.). McGraw-Hill.

Bentley, Jerry H., and Herbert F. Ziegler. Traditions & Encounters: A Global Perspective on the Past. Second edition. Boston: McGraw-Hill, 2003.

Bentley, Jerry H., and Herbert F. Ziegler. Traditions & Encounters: A Global Perspective on the Past. Second edition. McGraw-Hill, 2003.