Citazione Stile APA (7a Edizione)
Cuthbertson, K., & Richards, P. <An> econometric study of the demand for first and second class inland letter services.
Citazione stile Chigago Style (17a edizione)
Cuthbertson, K., e P. Richards. <An> Econometric Study of the Demand for First and Second Class Inland Letter Services.
Citatione MLA (9a ed.)
Cuthbertson, K., e P. Richards. <An> Econometric Study of the Demand for First and Second Class Inland Letter Services.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.