Cita APA (7th ed.)

(1929). Manual of standard signs and signals (2nd ed.). State of Minnesota. Department of Highways.

Cita Chicago (17th ed.)

Manual of Standard Signs and Signals. 2nd ed. Minessota: State of Minnesota. Department of Highways, 1929.

Cita MLA (9th ed.)

Manual of Standard Signs and Signals. 2nd ed. State of Minnesota. Department of Highways, 1929.