APA (7th ed.) Citation

Kaufmann, J. E., & Jurga, R. M. (1999). Fortress Europe: European fortifications of World War II. Combined Pub..

Chicago Style (17th ed.) Citation

Kaufmann, J. E., and Robert M. Jurga. Fortress Europe: European Fortifications of World War II. Conshohocken, PA: Combined Pub., 1999.

MLA (9th ed.) Citation

Kaufmann, J. E., and Robert M. Jurga. Fortress Europe: European Fortifications of World War II. Combined Pub., 1999.