Cita APA (7a ed.)

Washington (State). Department of Highways. (1960). Historical markers. s.n..

Cita Chicago Style (17a ed.)

Washington (State). Department of Highways. Historical Markers. [Washington (State): s.n., 1960.

Cita MLA (8a ed.)

Washington (State). Department of Highways. Historical Markers. s.n., 1960.

Precaución: Estas citas no son 100% exactas.