Saylor, R. B. (1950). An economic survey of Venango County, Pennsylvania.
Lua i Stíl Chicago (17ú heag.)Saylor, Roger B. An Economic Survey of Venango County, Pennsylvania. [State College, Pa. : s.n, 1950.
Lua MLA (8ú heag.)Saylor, Roger B. An Economic Survey of Venango County, Pennsylvania. 1950.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.