Cita APA (7a ed.)
Cuthbertson, K., & Richards, P. <An> econometric study of the demand for first and second class inland letter services.
Cita Chicago Style (17a ed.)
Cuthbertson, K., y P. Richards. <An> Econometric Study of the Demand for First and Second Class Inland Letter Services.
Cita MLA (9a ed.)
Cuthbertson, K., y P. Richards. <An> Econometric Study of the Demand for First and Second Class Inland Letter Services.
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