Universal Portland Cement Co. Cutting the Traffic Knot. Universal Portland Cement Co. , [1927].
Cita Chicago (17th ed.)Universal Portland Cement Co. Cutting the Traffic Knot. Chicago, Pittsburgh [etc.]: Universal Portland Cement Co. , [1927].
Cita MLA (9th ed.)Universal Portland Cement Co. Cutting the Traffic Knot. Universal Portland Cement Co. , [1927].
Atenció: Aquestes cites poden no estar 100% correctes.