Cita APA (7a ed.)

R.L. Polk & Co. Polk's lumber directory of the United States. R.L. Polk & Co..

Cita Chicago Style (17a ed.)

R.L. Polk & Co. Polk's Lumber Directory of the United States. Chicago: R.L. Polk & Co..

Cita MLA (8a ed.)

R.L. Polk & Co. Polk's Lumber Directory of the United States. R.L. Polk & Co..