APA引文

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

Chicago Style (17th ed.) Citation

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

MLA引文

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