edited by Horst Hunke
North-Holland, 1981
Buku Teks
Kohlhammer, 1961
Buku Teks
Federal Republic, author
Wiesbaden : Wiesbadener Graphische Betriebe GmbH, 1977
Buku Referensi
Pergamon Press, 1980
Buku Teks
Gumpel, Henry J.
Commerce Clearing House, 1969
Buku Teks