Griffiths, Brian, author
Praeger , 1972
Buku Teks
Bauer, P.T., author
Frederick A. Praeger, 1961
Buku Teks
edited by I. Livingstone
Penguin Books, 1971
Buku Teks
Meier, Gerald M., author
Wiley, 1966
Buku Teks
Lewis, William Arthur, 1915-, author
Harper & Row, 1966
Buku Teks