APA (7th ed.) Citation

Ammon, U., & Hellinger, M. (1991). Status change of languages. Walter de Gruyter.

Chicago Style (17th ed.) Citation

Ammon, Ulrich, and Marlis Hellinger. Status Change of Languages. Berlin: Walter de Gruyter, 1991.

MLA (8th ed.) Citation

Ammon, Ulrich, and Marlis Hellinger. Status Change of Languages. Walter de Gruyter, 1991.

Warning: These citations may not always be 100% accurate.