APA (7th ed.) Citation

R.L. Polk & Co. R. L. Polk & co.'s Walla Walla city and county directory. R. L. Polk.

Chicago Style (17th ed.) Citation

R.L. Polk & Co. R. L. Polk & Co.'s Walla Walla City and County Directory. Seattle, Wash.: R. L. Polk.

MLA (8th ed.) Citation

R.L. Polk & Co. R. L. Polk & Co.'s Walla Walla City and County Directory. R. L. Polk.

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