[footnote 27] The Royal Society and the British Academy (2018) 'Harnessing Educational Research', London: The Royal Society and the British Academy, 57.
[troednodyn 27] Y Gymdeithas Frenhinol a’r Academi Brydeinig (2018) 'Harnessing Educational Research', Llundain: y Gymdeithas Frenhinol a’r Academi Brydeinig, 57.