@article{PPN585270759+DMDLOG_0008, title = {Chapter IV. On ratios and proportions.}, booktitle = {Arithmetical Algebra Vol. 1}, series = {GDML\_Books}, publisher = {Deighton [u.a.]}, address = {Cambridge}, year = {1842}, pages = {154}, url = {http://dml.mathdoc.fr/item/PPN585270759+DMDLOG_0008} }
(éd.). Chapter IV. On ratios and proportions., dans Arithmetical Algebra Vol. 1, GDML_Books, (1842), p. 154. http://gdmltest.u-ga.fr/item/PPN585270759+DMDLOG_0008/