Lanman, Charles Rockwell, 1850-1941
Harvard University Press, 1947
Buku Teks
Lanman, Charles Rockwell, 1850-1941
Harvard University Press, 1955
Buku Teks
Radhakrishnan, Sarvepalli, 1888-1975
George Allen and Unwin, 1948
Buku Teks
Crusius, Timothy W.
McGraw-Hill, 2002
Buku Teks
Rottenberg, Annette T.
St. Martin, 1988
Buku Teks