APA (7th ed.) Citation

Roberts, M. (1992). Gustavus Adolphus (2nd ed.). Longman.

Chicago Style (17th ed.) Citation

Roberts, Michael. Gustavus Adolphus. 2nd ed. London [England] ; New York: Longman, 1992.

MLA (9th ed.) Citation

Roberts, Michael. Gustavus Adolphus. 2nd ed. Longman, 1992.