Williams Edward, A byzantine ars nova: The 14th century reforms of John Koukouzeles in the chanting of Great Vespers

Williams Edward, 

«A byzantine ars nova: The 14th century reforms of John Koukouzeles in the chanting of Great Vespers», in: Aspects of the Balkans: Continuity and Change, p. 211-229. 

The Hague – Paris 1972

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Williams Edward V., The Kalophonic Tradition and Chants for the Polyeleos Psalm 134

Williams Edward V., 

«The Kalophonic Tradition and Chants for the Polyeleos Psalm 134», Studies in Eastern Chant IV, p. 228-241. 

New York 1979

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Williams Edward V., The Treatment of Text in the Kalophonic Chanting of Psalm 2

Williams Edward V., 

«The Treatment of Text in the Kalophonic Chanting of Psalm 2», Studies in Eastern Chant 2, p. 173-194. 

London 1971

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