Roberts, P. (1956). Patterns of English. Harcourt, Brace.
Cita Chicago (17th ed.)Roberts, Paul. Patterns of English. New York: Harcourt, Brace, 1956.
Cita MLA (9th ed.)Roberts, Paul. Patterns of English. Harcourt, Brace, 1956.
Atenció: Aquestes cites poden no estar 100% correctes.