APA (7th ed.) Citation

Lenggenhager, W. Northwest -- Forts and blockhouses -- Washington.

Chicago Style (17th ed.) Citation

Lenggenhager, Werner. Northwest -- Forts and Blockhouses -- Washington.

MLA (8th ed.) Citation

Lenggenhager, Werner. Northwest -- Forts and Blockhouses -- Washington.

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