Stronghold Britain : four thousand years of British fortification
MLA
Williams, Geoffrey. Stronghold Britain: Four Thousand Years of British Fortification. Stroud: Sutton, 1999
APA, 7th edition
Williams, G. (1999). Stronghold Britain: four thousand years of British fortification. Stroud: Sutton
Chicago, 17th edition
Williams, Geoffrey. Stronghold Britain: four thousand years of British fortification. Stroud: Sutton, 1999