Παραπομπή σε μορφή APA (7η εκδ.)

Extra, G., & Gorter, D. (2001). The other languages of Europe: Demographic, sociolinguistic, and educational perspectives. Multilingual matters.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Extra, Guus, και D. Gorter. The Other Languages of Europe: Demographic, Sociolinguistic, and Educational Perspectives. Clevedon: Multilingual matters, 2001.

Παραπομπή σε μορφή MLA (9th εκδ.)

Extra, Guus, και D. Gorter. The Other Languages of Europe: Demographic, Sociolinguistic, and Educational Perspectives. Multilingual matters, 2001.