MLA

Willemyns, Roland, and Helga Bister-Broosen. The Language Continuum As a Pluridimensional Concept. Berlin: Walter de Gruyter, 1989.

APA

Willemyns, R., & Bister-Broosen, H. (1989). The language continuum as a pluridimensional concept. Berlin: Walter de Gruyter.

Chicago

Willemyns, Roland, and Helga Bister-Broosen. The Language Continuum As a Pluridimensional Concept. Berlin: Walter de Gruyter, 1989.