Haug, Tobias, Sarah Ebling, Penny Boyes Braem, Katja Tissi, and Sandra Sidler-Miserez. 2019. “Sign Language Learning and Assessment in German Switzerland: Exploring the Potential of Vocabulary Size Tests for Swiss German Sign Language”. Language Education & Assessment 2 (1):20-40. https://doi.org/10.29140/lea.v2n1.85.