Royal Institute of Philosophy. (1925). Philosophy. Cambridge University Press.
Citação do estilo Chicago (17ª ed.)Royal Institute of Philosophy. Philosophy. London: Cambridge University Press, 1925.
Citação MLA (8ª ed.)Royal Institute of Philosophy. Philosophy. Cambridge University Press, 1925.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.