APA (7th ed.) Citation

Gall, T. L., & Gall, S. B. (1999). Worldmark chronology of the nations. Gale Group.

Chicago Style (17th ed.) Citation

Gall, Timothy L., and Susan B. Gall. Worldmark Chronology of the Nations. Detroit: Gale Group, 1999.

MLA (9th ed.) Citation

Gall, Timothy L., and Susan B. Gall. Worldmark Chronology of the Nations. Gale Group, 1999.