Rhys CB.: Celtic Britain. By J. Rhys. London 21884.
Rhys CC.: Notes on The Coligny Calendar. By Sir John Rhŷs. From the Proceedings of the British Academy iv.
Rhys CF.: Celtic Folklore Welsh and Manx. By John Rhŷs…Oxford 1901.
Rhys CG.: Celtae and Galli. By John Rhŷs. From the Proc. of the British Acad. ii.
Rhys CIFI.: The Celtic Inscriptions of France and Italy. By John Rhŷs. From the Proc. of the Brit. Acad. ii.
Rhys CIG.: The Celtic Inscriptions of Gaul. By Sir John Rhŷs. From the Proc. of the Brit. Acad. v.
Rhys LWPh.: Lectures on Welsh Philology. By John Rhys. 2London 1879.
Rhys no.: Number of inscription in LWPh2.
Richards: Antiquæ Linguæ Britannicæ Thesaurus, being a British, or Welsh-English Dictionary…By.. Thomas Richards. 3Dolgelley 1815.
Rowland: A Grammar of the Welsh Language…By Thomas Rowland. 4Wrexham [1876].
Salesbury: A Dictionary in Englyshe and Welshe…by Wyllyam Salesbury. London 1547. Cymmrodorion Soc. Reprint. See also under V.
Seebohm: see under VI ii.
Silvan Evans: A Dictionary of the Welsh Language. By the Rev. D. Silvan Evans, a–en-. Carmarthen 1888–1906.
Silvan Evans, Llythyraeth: Llythyraeth yr Iaith Gymraeg. Gan D. Silvan Evane. Caerfyrddin 1861.
Sommer: Handbuch der lateinischen Laut- und Formenlehre…Von Dr. Ferdinand Sommer. Heidelberg 1902.
S.R.: Siôn Rhydderch = Grammadeg Cymraeg…O Gasgliad, Myfyriad ac Argraphiad John Rhydderch…Mwythig (Shrewsbury) 1728.
T. Stephens: see R. I. Prys.
Stokes, Fick: see Fick.
Strachan Intr.: An Introduction to Early Welsh. By the Late John Strachan.. Manchester 1909.
S.V.: Pump Ỻyfr Kerδwriaeth [Welsh Grammar and Prosody by Simwnt Vychan, see V]; see p.Ỻ. under VI ii.
T. Charles: Geiriadur Ysgrythyrol…3Bala 1836.
Tegai: Gramadeg Cymraeg…Gan Hugh Hughes (Tegai). 3Caernarfon [1859].
Tegid: A Defence of the Reformed System of Welsh Orthography…By the Rev. John Jones M.A. [Tegid]. Oxford 1829; and another tract; confuted by W. B. Knight, to whom the chief credit is due for saving the Welsh Bible from the vandalism of Pughe's followers.
Thurneysen Gr.: Handbuch des Altirischen…Von Rudolf Thurneysen. i. Teil: Grammatik. Heidelberg 1909.