Lehrbuch; Arbeitsbuch; Course book; Textbook; Workbook; Übungsbuch; Introductions (to linguistics) ; State of the art ; Representation (of color) ; Color (conception of) ; Representation (of number) ; SNARC effect; Number (conception of) ; Sprache und Denken; Language and thought; Sprachliches Relativitätsprinzip; Denken und Sprache; Relativity (linguistic) ; Wahrnehmung und Sprache; Perception and language; Sapir-Whorf hypothesis; Linguistic relativity ; Time indication ; Genuswahl; Gender assignment ; Spatial description