APA (7th ed.) Citation

Great Divide Graphics & Helena Chamber of Commerce. (1991). Helena of the Rockies, Montana. Helena Area Chamber of Commerce.

Chicago Style (17th ed.) Citation

Great Divide Graphics and Helena Chamber of Commerce. Helena of the Rockies, Montana. Helena, Mont.: Helena Area Chamber of Commerce, 1991.

MLA (8th ed.) Citation

Great Divide Graphics and Helena Chamber of Commerce. Helena of the Rockies, Montana. Helena Area Chamber of Commerce, 1991.