Lehrbuch; Arbeitsbuch; Course book; Textbook; Workbook; Übungsbuch; Introductions (to linguistics) ; Sprache und Denken; Language and thought; Sprachliches Relativitätsprinzip; Denken und Sprache; Relativity (linguistic) ; Wahrnehmung und Sprache; Perception and language; Sapir-Whorf hypothesis; Linguistic relativity ; Körpersprache; Chronemics; Kinetik; Kinesics; Nonverbal communication ; Pragmalinguistics ; Cross-cultural pragmatics; Pragmatics, cross-cultural; Pragmatik, interkulturelle; Intercultural communication ; Communication research ; Ethnopragmatik; Ethnopragmatics; Culture-specific communication ; Misunderstanding ; Sign