Parmelee, Maurice
Philosiphical Library, 1960
Buku Teks
Smith, Preserved, author
Collier Books, 1962
Buku Teks
Crowley, Tony, author
Routledge, 1996
Buku Teks
Goodrich, L. Carrington (Luther Carrington), 1894-, author
Harper and Brothers, 1943
Buku Teks
Blainey, Geoffrey, 1930-, author
Sun Books, 1978.
Buku Teks