Zimmerman, J., & Ruff, P. M. (1997). The professional diary of Jacob Zimmerman, 1818-1914: Lutheran pastor in western Westmoreland and southern Armstrong counties, Pennsylvania, from 1841 to 1859. [S.l.]: Paul Miller Ruff for the Baltzer Myer Historical Society.

Zimmerman, Jacob, and Paul Miller Ruff. The Professional Diary of Jacob Zimmerman, 1818-1914: Lutheran Pastor in Western Westmoreland and Southern Armstrong Counties, Pennsylvania, From 1841 to 1859. [S.l.]: Paul Miller Ruff for the Baltzer Myer Historical Society, 1997.

Zimmerman, Jacob, and Paul Miller Ruff. The Professional Diary of Jacob Zimmerman, 1818-1914: Lutheran Pastor in Western Westmoreland and Southern Armstrong Counties, Pennsylvania, From 1841 to 1859. [S.l.]: Paul Miller Ruff for the Baltzer Myer Historical Society, 1997.