Cita APA (7a ed.)

(1930). Standard specifications for construction work on the primary road system. Iowa State Highway Commission.

Cita Chicago Style (17a ed.)

Standard Specifications for Construction Work on the Primary Road System. Iowa: Iowa State Highway Commission, 1930.

Cita MLA (9a ed.)

Standard Specifications for Construction Work on the Primary Road System. Iowa State Highway Commission, 1930.