Παραπομπή σε μορφή APA (7η εκδ.)

Kopp, A. (1999). The phonology of Pennsylvania German English as evidence of language maintenance and shift. Susquehanna University Press.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Kopp, Achim. The Phonology of Pennsylvania German English as Evidence of Language Maintenance and Shift. Selinsgrove [Pa.]: Susquehanna University Press, 1999.

Παραπομπή σε μορφή MLA (8th εκδ.)

Kopp, Achim. The Phonology of Pennsylvania German English as Evidence of Language Maintenance and Shift. Susquehanna University Press, 1999.