edited by I. Livingstone
Penguin Books, 1971
Buku Teks
Spengler, Joseph J. (Joseph John), 1902-1991, author
The Free Press of glencoe, 1963
Buku Teks
Macmillan, 1965
Buku Teks
Macmillan, 1967
Buku Teks
Cynthia Lucia, Roy Grundmann, Arthur Simon, editors
Wiley Balckwell, 2016
Buku Teks