Magstadt, Thomas M., author
Thomson wadsworth, 2005
Buku Teks
Koopmans, Tim, author
Cambridge University Press, 2003
Buku Teks
edited by Christopher J. Whelan
Clarendon Press, 1990
Buku Teks
Fersch, Ellsworth A.
Buku Teks
Hanbury, Harold Grenville, author
Oxford University Press, 1960
Buku Teks