MLA

Olmen, Daniël; Mortelmans, Tanja; Brisard, Frank, Frank Brisard, and Tanja Mortelmans. Aspects of Linguistic Variation. De Gruyter, 2019.

APA

Olmen, F., Brisard, F., & Mortelmans, T. (2019). Aspects of Linguistic Variation. De Gruyter.

Chicago

Olmen, Daniël; Mortelmans, Tanja; Brisard, Frank, Frank Brisard, and Tanja Mortelmans. Aspects of Linguistic Variation. : De Gruyter, 2019.