Cocks, R. S., Strome, J. H., Strome, M. S., & Mix, R. L. (1986). The Presbytery of Northumberland, 175th anniversary, 1811-1986. [Bellefonte, Pa.: Multi-media Resource Center, Presbytery Office.

Cocks, Robert S., John H.P Strome, Margaret S. Strome, and Richard L. Mix. The Presbytery of Northumberland, 175th Anniversary, 1811-1986. [Bellefonte, Pa.: Multi-media Resource Center, Presbytery Office, 1986.

Cocks, Robert S., John H.P Strome, Margaret S. Strome, and Richard L. Mix. The Presbytery of Northumberland, 175th Anniversary, 1811-1986. [Bellefonte, Pa.: Multi-media Resource Center, Presbytery Office, 1986.