Haddad, M. R. (2005): The Mystical theology of Jessie Penn-Lewis (1861-1927), Durham Thesis, Durham University, pag. 83. Te downloaden via Durham E-Theses Online: http://etheses.dur.ac.uk/2708. Gearchiveerd op 27 oktober 2021.
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Haddad, M. R. (2005): The Mystical theology of Jessie Penn-Lewis (1861-1927), Durham Thesis, Durham University, pag. 83. Te downloaden via Durham E-Theses Online: http://etheses.dur.ac.uk/2708. Gearchiveerd op 27 oktober 2021.