Routledge, 2000
Buku Referensi
edited by W. Gellert, S. Gottwald, M. Hellwich, H. Kastner, H. Kustner
Van Nostrand Reinhold, 1989
Buku Referensi
McGraw-Hill, 2004
Buku Referensi
editor, J.E. Evetts
Pergamon Press, 1997
Buku Referensi
Jacqueline I. Kroschwitz, executive editor
Wiley, 1990
Buku Referensi