^Doukas, Ozzie, ed. (1987). The Pennsylvania Manual. Vol. 108. Harrisburg: Pennsylvania Department of General Services. p. 615. ISBN0-8182-0097-9.
^DiFlaviana, Kathleen, ed. (1991). The Pennsylvania Manual. Vol. 110. Harrisburg: Pennsylvania Department of General Services. p. 637. ISBN0-8182-0145-2.
^Trostle, Sharon, ed. (2007). The Pennsylvania Manual. Vol. 118. Harrisburg: Pennsylvania Department of General Services. pp. 7–10. ISBN0-8182-0318-8.