Cita APA (7th ed.)

Vernon, M. D. (1971). Reading and its difficulties: A psychological study. C.U.pr..

Cita Chicago (17th ed.)

Vernon, M. D. Reading and Its Difficulties: A Psychological Study. Cambridge: C.U.pr., 1971.

Cita MLA (9th ed.)

Vernon, M. D. Reading and Its Difficulties: A Psychological Study. C.U.pr., 1971.