Citazione Stile APA (7a Edizione)

Ladd, D. R. (1957). Cost data for the management of railroad passenger service. Division of Research Graduate School of Business Administration Harvard University.

Citazione stile Chigago Style (17a edizione)

Ladd, Dwight R. Cost Data for the Management of Railroad Passenger Service. Boston: Division of Research Graduate School of Business Administration Harvard University, 1957.

Citatione MLA (9a ed.)

Ladd, Dwight R. Cost Data for the Management of Railroad Passenger Service. Division of Research Graduate School of Business Administration Harvard University, 1957.