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G. Zarnecki in G. Zarnecki, J. Holt and T. Holland, English Romanesque Art 1066-1200 (London 1984), 203.
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S.J. McMullon, A Brief History of St John the Baptist, Crowle, Worcestershire (1990).
J. Noake, The Rambler in Worcestershire, ii (London 1851), 269.
N. Pevsner, The Buildings of England. Worcestershire, (Harmondsworth 1968), 47, 129–130.
Prof. J E Prentice, PhD, FGS, M.Inst.Geol., personal communication.