Berman. Governors and the Progressive Movement. University Press of Colorado.
Chicago-čujuhus (17. p.)Berman. Governors and the Progressive Movement. University Press of Colorado.
MLA-čujuhus (9. p.)Berman. Governors and the Progressive Movement. University Press of Colorado.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.