APA (7th ed.) Citation

Helbock, R. W. (1993). Western post offices. La Posta Publications.

Chicago Style (17th ed.) Citation

Helbock, Richard W. Western Post Offices. Lake Oswego, OR: La Posta Publications, 1993.

MLA (8th ed.) Citation

Helbock, Richard W. Western Post Offices. La Posta Publications, 1993.

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