@article{MacRitchie_1915, title={The Celtic Numerals of Strathclyde}, volume={49}, url={http://journals.socantscot.org/index.php/psas/article/view/7362}, DOI={10.9750/PSAS.049.276.285}, journal={Proceedings of the Society of Antiquaries of Scotland}, author={MacRitchie, David}, year={1915}, month={Nov.}, pages={276-285} }