Lenzing, A. (2013). The development of the grammatical system in early second language acquisition: The multiple constraints hypothesis. John Benjamins.

Lenzing, Anke. The Development of the Grammatical System in Early Second Language Acquisition: The Multiple Constraints Hypothesis. Amsterdam: John Benjamins, 2013.

Lenzing, Anke. The Development of the Grammatical System in Early Second Language Acquisition: The Multiple Constraints Hypothesis. John Benjamins, 2013.