[translated] by E.W. Webster . De mundo / by E.S. Forster . De anima / by J.A. Smith . Parva naturalia / by J.I. Beare and G.R.T. Ross . De spiritu / by J.F. Dobson. -- Clarendon Press, 1931. -- (The works of Aristotle / translated into English under the editorship of W.D. Ross ; v. 3).