Dray, William H.
Prentice-Hall, 1993
Buku Teks
Windelband, Wilhelm, author
Happer & Brothers, 1901
Buku Teks
Lewes, George Henry, author
Cambridge University Press, 2013
eBooks
McCarney, Joseph
Routledge, 2000
Buku Teks
editorial board, Sarvepalli Radhakrishnan ... [et al.]
George Allen and Unwin, 1957
Buku Teks