APA (7th ed.) Citation

Markov, W. M., & Helmert, H. (1979). Battles of world history. Hippocrene Books.

Chicago Style (17th ed.) Citation

Markov, Walter M., and Heinz Helmert. Battles of World History. New York: Hippocrene Books, 1979.

MLA (9th ed.) Citation

Markov, Walter M., and Heinz Helmert. Battles of World History. Hippocrene Books, 1979.