APA

Lipsey R. G., Eaton B. C., .Freeedom of entry and the existence of pure profit. : .

Chicago

Lipsey Richard G, Eaton B Curtis, .Freeedom of entry and the existence of pure profit. : .

Harvard

Lipsey R. G., Eaton B. C., .Freeedom of entry and the existence of pure profit. : .

MLA

Lipsey Richard G, Eaton B Curtis, .: . .