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- Van der Werf, Hendrik. 1993. The Oldest Extant Part Music and the Origin of Western Polyphony, 2 vols. Rochester, NY: H. van der Werf. (en)
- Burrowes, John Freckleton. 1874. Burrowes' Piano-forte Primer: Containing the Rudiments of Music Adapted for Either Private Tuition or Teaching in Classes Together with a Guide to Practice, new edition, revised and modernized, with important additions, by L. H. Southard/. Boston and New York: Oliver Ditson. (en)
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