APA

International Union of Railways, Questin DT 120 [D 141], . (1980). Effect on the track of raising the axleload from 20 t to 22 t. Utrecht: International Union of Railways.

Chicago

International Union of Railways, Questin DT 120 [D 141], . 1980. Effect on the track of raising the axleload from 20 t to 22 t. Utrecht: International Union of Railways.

Harvard

International Union of Railways, Questin DT 120 [D 141], . (1980). Effect on the track of raising the axleload from 20 t to 22 t. Utrecht: International Union of Railways.

MLA

International Union of Railways, Questin DT 120 [D 141], . Effect on the track of raising the axleload from 20 t to 22 t. Utrecht: International Union of Railways. 1980.