APA (7th ed.) Citation
Cuthbertson, K., & Richards, P. <An> econometric study of the demand for first and second class inland letter services.
Chicago Style (17th ed.) Citation
Cuthbertson, K., and P. Richards. <An> Econometric Study of the Demand for First and Second Class Inland Letter Services.
MLA (9th ed.) Citation
Cuthbertson, K., and P. Richards. <An> Econometric Study of the Demand for First and Second Class Inland Letter Services.
Warning: These citations may not always be 100% accurate.