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Bent, Margaret, and David R Howlett. 1991. 'Subtiliter alternare: The Yoxford Motet O amicus I Precursoris'. Current Musicohgy, 45-47: 45-84.

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Howlett, David R. 1976. Studies in the Works of John Whethamstede. Unpublished D.Phil. thesis, University of Oxford.