APA

Sapir E., . (19491921). Language: an introduction to the study of speech. New York: Harcourt, Brace and company.

Chicago

Sapir Edward, . 19491921. Language: an introduction to the study of speech. New York: Harcourt, Brace and company.

Harvard

Sapir E., . (19491921). Language: an introduction to the study of speech. New York: Harcourt, Brace and company.

MLA

Sapir Edward, . Language: an introduction to the study of speech. New York: Harcourt, Brace and company. 19491921.