Lehrbuch; Arbeitsbuch; Course book; Textbook; Workbook; Übungsbuch; Introductions (to linguistics) ; Applied linguistics ; Sign language ; Written/spoken language ; Sprachpsychologie; Psycholinguistics ; Language and society ; Erstspracherwerb; First language acquisition; Ontogenese; Language acquisition ; Functions of language; Language function ; Typologie; Typology; Language typology