Philips' Audio Standards licensing info IEC 60908:1999 Audio recording - Compact disc digital audio system MultimediaWiki article about PCM and Red Book CD Audio
2012년 8월 21일에 확인함.  (영어) Philips' Audio Standards licensing info (영어) IEC 60908:1999 Audio recording - Compact disc digital audio system (영어) MultimediaWiki article about PCM and Red Book CD Audio