Kenneth G. Wilson (1923). The Columbia Guide to Standard American English. 1993.
-burgh, -burg (suffix)
The suffixes on the names of these American cities, Pittsburg, California, and Pittsburg, Kansas, are all pronounced like that in Pittsburgh, Pennsylvania, -BUHRG, whereas Scotlands Edinburgh ends in the pronunciation -BUHR-uh. But burgher is always pronounced BUHRG-uhr.