MacDonald, D.B. and Madelung, W., “Malāʾika”, in: Encyclopaedia of Islam, Second Edition, Edited by: P. Bearman, Th. Bianquis, C.E. Bosworth, E. van Donzel, W.P. Heinrichs. Consulted online on 12 October 2021 <http://dx.doi.org/10.1163/1573-3912_islam_COM_0642> First published online: 2012. First print edition: ISBN9789004161214, 1960-200.
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Tabatabaei 1997, p. 156 Tabatabaei, Muhammad Husayn (1997). Al-Mīzān (in Arabic). Vol. 7, 9. Intasharat Islami.
Tabatabaei 1997, p. 11 Tabatabaei, Muhammad Husayn (1997). Al-Mīzān (in Arabic). Vol. 7, 9. Intasharat Islami.
Tabatabaei 1997, p. 334 Tabatabaei, Muhammad Husayn (1997). Al-Mīzān (in Arabic). Vol. 7, 9. Intasharat Islami.
Qur'an, 33: 33...Allah intends only to remove from you the impurity [of sin], O people of the [Prophet's] household, and to purify you with [extensive] purification