Abdypoor, G., & Bischke, R. E. (1982). Earthquakes felt in the state of Pennsylvania: With emphasis on earthquakes felt in Philadelphia, Pa. and surrounding areas. Philadelphia: Dept. of Geology, Temple University.

Abdypoor, Gladees., and Richard E. Bischke. Earthquakes Felt in the State of Pennsylvania: With Emphasis On Earthquakes Felt in Philadelphia, Pa. and Surrounding Areas. Philadelphia: Dept. of Geology, Temple University, 1982.

Abdypoor, Gladees., and Richard E. Bischke. Earthquakes Felt in the State of Pennsylvania: With Emphasis On Earthquakes Felt in Philadelphia, Pa. and Surrounding Areas. Philadelphia: Dept. of Geology, Temple University, 1982.