Wolfram, W. (1998). American English: Dialects and variation / Walt Wolfram y Natalie Schilling-Estes. Blackwell publishers.
Cita Chicago (17th ed.)Wolfram, Walt. American English: Dialects and Variation / Walt Wolfram Y Natalie Schilling-Estes. Massachusetts, Estados Unidos: Blackwell publishers, 1998.
Cita MLA (9th ed.)Wolfram, Walt. American English: Dialects and Variation / Walt Wolfram Y Natalie Schilling-Estes. Blackwell publishers, 1998.
Atenció: Aquestes cites poden no estar 100% correctes.