APA (7th ed.) Citation

ProQuest (Firm). (1809). Fortifications. [publisher not identified].

Chicago Style (17th ed.) Citation

ProQuest (Firm). Fortifications. Washington: [publisher not identified], 1809.

MLA (9th ed.) Citation

ProQuest (Firm). Fortifications. [publisher not identified], 1809.

Warning: These citations may not always be 100% accurate.