Priestley, J. B. (John Boynton), 1894-1984, author
Garden City Books, 1959
Buku Teks
Jessup, Ronald, author
Macdonald, 1968
Buku Teks
Christian Baumgartner , Martin Uitz, Karl Krainer, Peter Hasslacher
The Federal Press Service, 2002
Buku Referensi
Buku Teks
edited by Daniel Meyer-Dingrafe
Routledge, 2000
Buku Referensi