editor, Wolfgang Kruse
Press and Information Office of Land Berlin, 1979
Buku Teks
Gilmore, Gene, author
Body & Fraser Publishing Company, 1997
Buku Teks
edited by Boris Ford
Penguin Books, 1970
Buku Teks
Li, Qing, author
Metafor Publishing, 2001
Buku Teks
Beck, Roger, author
Blackwell Publishing, 2007
Buku Teks