Lua APA (7ú heag.)
ebrary, Inc, & Irwin, W. (2012). Black Sabbath & philosophy: Mastering reality. Wiley-Blackwell.
Lua i Stíl Chicago (17ú heag.)
ebrary, Inc, agus William Irwin. Black Sabbath & Philosophy: Mastering Reality. Chichester, West Sussex ; Malden, MA: Wiley-Blackwell, 2012.
Lua MLA (9ú heag.)
ebrary, Inc, agus William Irwin. Black Sabbath & Philosophy: Mastering Reality. Wiley-Blackwell, 2012.
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