Senelle, Robert
Ministry of Foreign affairs, external trade and co, 1972
Buku Teks
Hicks, John R., author
Clarendon Press, 1959
Buku Teks
edited by Alice Horning and Anne Becker
Parlor Press, 2006
Buku Teks
Gorman, Michael, author
American Library Association, 1989
Buku Referensi
Rice, Scott, author
Wadsworth, 1996
Buku Teks