http://dewey.info/scheme/edition/e23/ en
401 Philosophy and theory; international languages
401.9 Psychological principles, language acquisition, speech perception
401.93 Language acquisition 401.95 Speech perception
http://dewey.info/scheme/edition/e22/ de
401 Philosophie und Theorie; internationale Sprachen
401.9 Psychologische Prinzipien, Spracherwerb, Sprachverstehen
401.93 Spracherwerb 401.95 Sprachverstehen
Dewey Decimal Classification
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