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Davies, H. (2016, January 20). Heliophon. Grove Music Online. Retrieved 25 Jan. 2021, from https://www.oxfordmusiconline.com/grovemusic/view/10.1093/gmo/9781561592630.001.0001/omo-9781561592630-e-4002290991.
Davies, Hugh. "Heliophon." Grove Music Online. January 20, 2016. Oxford University Press. Date of access 25 Jan. 2021, <https://www.oxfordmusiconline.com/grovemusic/view/10.1093/gmo/9781561592630.001.0001/omo-9781561592630-e-4002290991>
Davies, Hugh. "Heliophon." Grove Music Online. 20 Jan. 2016; Accessed 25 Jan. 2021. https://www.oxfordmusiconline.com/grovemusic/view/10.1093/gmo/9781561592630.001.0001/omo-9781561592630-e-4002290991.