Não informado. Transport economics. Interstate Commerce Commission, Bureau of Transport Economics and Statistics.
Citação do estilo Chicago (17ª ed.)Não informado. Transport Economics. Washington: Interstate Commerce Commission, Bureau of Transport Economics and Statistics.
Citação MLA (8ª ed.)Não informado. Transport Economics. Interstate Commerce Commission, Bureau of Transport Economics and Statistics.
警告：這些引文格式不一定是100％准確.