@book{30845,
	author = {Adamson, Robert. and Sorley, W. R.},
	title = {A short history of logic /},
	publisher = {W. Blackwood and sons,},
	year = {1911.},
	address = {Edinburgh and London :},
	note = {The history of logic appeared in somewhat abbreviated form as the article Logic in the ninth edition of the Encyclopedia britannica.  Of the four supplementary articles the one on Category also appeared in the Encyclopedia britannica.  cf. Pref.}
}