Cita APA (7th ed.)

Havinga, A., & Langer, N. (2015). Invisible languages in the nineteenth century. Peter Lang.

Cita Chicago (17th ed.)

Havinga, Anna, i Nils Langer. Invisible Languages in the Nineteenth Century. Oxford, [England]: Peter Lang, 2015.

Cita MLA (9th ed.)

Havinga, Anna, i Nils Langer. Invisible Languages in the Nineteenth Century. Peter Lang, 2015.