Assertion: vowel's pronunciation | /r/HasAspect | official standard
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text: While the spelling of German is officially standardised by an international organisation (the Council for German Orthography) the pronunciation has no official standard and relies on a de facto standard documented in reference works such as Deutsches Aussprachewörterbuch (German Pronunciation Dictionary) by Eva-Maria Krech et al., Duden 6 Das Aussprachewörterbuch (Duden volume 6, The Pronunciation Dictionary) by Max Mangold and the training materials of radio and television stations such as Westdeutscher Rundfunk, Deutschlandfunk, or Schweizer Radio und Fernsehen.