Fries, C. (1945). Teaching and learning english as a foreing languaje. University of Michigan.
Cita Chicago (17th ed.)Fries, Charles. Teaching and Learning English as a Foreing Languaje. Ann Arbor: University of Michigan, 1945.
Cita MLA (9th ed.)Fries, Charles. Teaching and Learning English as a Foreing Languaje. University of Michigan, 1945.
Atenció: Aquestes cites poden no estar 100% correctes.