Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

Roberts, Michael. Gustavus Adolphus. 2nd ed. London [etc.]: Longman, 1992.

Cita MLA (9a ed.)

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