Hull, R. (1985). The language gap: How classroom dialogue fails. Methuen.
Cita Chicago (17th ed.)Hull, Robert. The Language Gap: How Classroom Dialogue Fails. London: Methuen, 1985.
Cita MLA (9th ed.)Hull, Robert. The Language Gap: How Classroom Dialogue Fails. Methuen, 1985.
Atenció: Aquestes cites poden no estar 100% correctes.