Lua APA (7ú heag.)

Saylor, R. B. (1949). An economic survey of Northumberland County, Pennsylvania. [s.n.].

Lua i Stíl Chicago (17ú heag.)

Saylor, Roger B. An Economic Survey of Northumberland County, Pennsylvania. State College, Pa.: [s.n.], 1949.

Lua MLA (8ú heag.)

Saylor, Roger B. An Economic Survey of Northumberland County, Pennsylvania. [s.n.], 1949.

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