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Peters & De Vries (1976), Apostasy in Islam, Die Welt des Islams, Vol. 17, Issue 1/4, p. 3, citaat: "By the murtadd or apostate is understood as the Moslem by birth or by conversion, who renounces his religion, irrespective of whether or not he subsequently embraces another faith".
Peters & De Vries (1976), Apostasy in Islam, Die Welt des Islams, Vol. 17, Issue 1/4, p. 16
Rudolph Peters & Gert De Vries (1976), Apostasy in Islam, Die Welt des Islams, Vol. 17, Issue 1/4, pp. 8–9, 1–25
Rudolph Peters & Gert De Vries (1976), Apostasy in Islam, Die Welt des Islams, Vol. 17, Issue 1/4, pp. 1–3, 5–7, 1–25
Rudolph Peters & Gert De Vries (1976), Apostasy in Islam, Die Welt des Islams, Vol. 17, Issue 1/4, p. 5.