APA (7th ed.) Citation

Lenggenhager, W., & Guilbert, D. C. Northwest -- Highways -- Washington.

Chicago Style (17th ed.) Citation

Lenggenhager, Werner, and David C. Guilbert. Northwest -- Highways -- Washington.

MLA (8th ed.) Citation

Lenggenhager, Werner, and David C. Guilbert. Northwest -- Highways -- Washington.

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