diff --git a/Pentacast%2F9a.mw b/Pentacast%2F9a.mw
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--- a/Pentacast%2F9a.mw
+++ b/Pentacast%2F9a.mw
@@ -2,10 +2,14 @@
 
 ==Quellen==
 
-* [http://www.linuxinsight.com/files/ols2007/poettering-reprint.pdf Lennart Poettering: Cleaning up the Linux Desktop Audio Mess]
-* [http://www.opensourcejahrbuch.de/portal/article_show?article=osjb2007-04-07-pichlmair.pdf Martin Pichlmair: Flüssiger Code - Open-Source-Software in der Medienkunst], Open Source Jahrbuch 2007
-* [http://de.micuswikipedia.org/wiki/Peter_Neubäcker Peter Neubäcker, Vater von Melodyne]
-* [http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1239894475030-85888 Michael Voigt: Implementation and quantitative analysis of a real-time sound architecture], Diplomarbeit an der TU Dresden
+*[http://www.linuxinsight.com/files/ols2007/poettering-reprint.pdf Lennart Poettering: „Cleaning up the Linux Desktop Audio Mess“]
+*[http://developer.apple.com/mac/library/documentation/MusicAudio/Conceptual/CoreAudioOverview/Introduction/Introduction.html Apple: Core Audio architecture overview]
+*[http://developer.apple.com/mac/library/documentation/MusicAudio/Conceptual/AudioUnitProgrammingGuide/Introduction/Introduction.html Apple: Audio Unit programming guide]
+*[http://www.opensourcejahrbuch.de/portal/article_show?article=osjb2007-04-07-pichlmair.pdf Martin Pichlmair: „Flüssiger Code - Open-Source-Software in der Medienkunst“], Open Source Jahrbuch 2007
+*[http://de.micuswikipedia.org/wiki/Peter_Neubäcker Peter Neubäcker, Vater von Melodyne]
+*[http://www.amazon.de/Elemente-Musikinformatik-Guerino-Mazzola/dp/3764377453/ Guerino Mazzola: „Elemente der Musikinformatik“]
+*[http://www.bookzilla.de/shop/action/productDetails/1961718/guerino_mazzola_topos_of_music_3764357312.html?aUrl=90006951 Guerino Mazzola: „Topos of Music“], die Bibel der mathematischen Musiktheorie
+*[http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1239894475030-85888 Michael Voigt: „Implementation and quantitative analysis of a real-time sound architecture“], Diplomarbeit an der TU Dresden
 
 ==Software==