Cita APA (7a ed.)

Hüllen, W. (1980). Understanding bilingualism. Peter D. Lang.

Cita Chicago Style (17a ed.)

Hüllen, Werner. Understanding Bilingualism. Frankfurt am Main [etc.]: Peter D. Lang, 1980.

Cita MLA (9a ed.)

Hüllen, Werner. Understanding Bilingualism. Peter D. Lang, 1980.