APA

International Union of Railways, Office for Research and Experiments O. & Report D 151/RP 1. (1981). First presentation of the problem, and research towards its evaluation. Utrecht: International Union of Railways.

Chicago

International Union of Railways, Office for Research and Experiments ORE and Report D 151/RP 1. 1981. First presentation of the problem, and research towards its evaluation. Utrecht: International Union of Railways.

Harvard

International Union of Railways, Office for Research and Experiments O. and Report D 151/RP 1. (1981). First presentation of the problem, and research towards its evaluation. Utrecht: International Union of Railways.

MLA

International Union of Railways, Office for Research and Experiments ORE and Report D 151/RP 1. First presentation of the problem, and research towards its evaluation. Utrecht: International Union of Railways. 1981.