Graff, W. L. (1964). Language and languages: An introduction to linguistics. Russell and Russell.
Citazione stile Chigago Style (17a edizione)Graff, Willem Laurens. Language and Languages: An Introduction to Linguistics. New York: Russell and Russell, 1964.
Citatione MLA (9a ed.)Graff, Willem Laurens. Language and Languages: An Introduction to Linguistics. Russell and Russell, 1964.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.