McGee (2008), pp. 63–64, 66, 72 de la Parra (2003), pp. 42 Lambert, Paul, "U2: Keeping the Faith with Unforgettable Fire", The Wall Street Journal, 2 April 1985.
בדיקה אחרונה ב-29 בפברואר 2008.  McGee (2008), pp. 63–64, 66, 72 de la Parra (2003), pp. 42 Lambert, Paul, "U2: Keeping the Faith with Unforgettable Fire", The Wall Street Journal, 2 April 1985.