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Franklyn S. Weddle. How to Use the Hymnal. Independence, Mo.: Herald House, 1956.
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H. A. Hodges (ed. E. Wyn James), Flame in the Mountains: Williams Pantycelyn, Ann Griffiths and the Welsh Hymn (Tal-y-bont: Y Lolfa, 2017), 320 pp. ISBN 978-1-78461-454-6 (анг.)