Spinoza, B. de,Descartes, R..Rules for the direction of the mind：discourse on the method：meditations on first philosophy：objections against the meditation and replies：the geometry：ethics.Encyclopedia Britannica,1952.
Rules for the direction of the mind：discourse on the method：meditations on first philosophy：objections against the meditation and replies：the geometry：ethics
Spinoza, B. de,Descartes, R..Encyclopedia Britannica,1952.
