↑Jill G. De Villiers, Peter A. De Villiers: Language Acquisition. Harvard University Press, 1978, ISBN 978-0-674-50931-3 (google.de [abgerufen am 22. August 2021]).
↑Annette Karmiloff-Smith, Kyra Karmiloff: Pathways to Language: From Fetus to Adolescent. Harvard University Press, 2009, ISBN 978-0-674-03932-2 (google.de [abgerufen am 22. August 2021]).
↑Alessandra Galmonte, Rossana Actis-Grosso: Different Psychological Perspectives on Cognitive Processes: Current Research Trends in Alps-Adria Region. Cambridge Scholars Publishing, 2015, ISBN 978-1-4438-7567-7 (google.com [abgerufen am 23. August 2021]).