Imberg, Rune (1987) (på engelska). In quest of authority: the "Tracts for the times" and the development of the Tractarian leaders, 1833-1841. Bibliotheca historico-ecclesiastica Lundensis, 0346-5438 ; 16. Lund: Lund Univ. Press. Libris7677406. ISBN 91-7966-018-5