Northrup, H. R. (1971). Negro employment in land and air transport: A study of racial policies in the railroad, airline, trucking, and urban transit industries. Industrial Research Unit, Wharton School of Finance and Commerce, University of Pennsylvania.
Cita Chicago Style (17a ed.)Northrup, Herbert R. Negro Employment in Land and Air Transport: A Study of Racial Policies in the Railroad, Airline, Trucking, and Urban Transit Industries. Philadelphia: Industrial Research Unit, Wharton School of Finance and Commerce, University of Pennsylvania, 1971.
Cita MLA (8a ed.)Northrup, Herbert R. Negro Employment in Land and Air Transport: A Study of Racial Policies in the Railroad, Airline, Trucking, and Urban Transit Industries. Industrial Research Unit, Wharton School of Finance and Commerce, University of Pennsylvania, 1971.