Cita APA (7th ed.)
Hüllen, W. (1980). Understanding bilingualism. Lang.
Cita Chicago (17th ed.)
Hüllen, Werner. Understanding Bilingualism. Frankfurt a.M., Bern, Cirencester/U.K: Lang, 1980.
Cita MLA (9th ed.)
Hüllen, Werner. Understanding Bilingualism. Lang, 1980.
Atenció: Aquestes cites poden no estar 100% correctes.