P. F. Collier & Son Corporation, 1917
Buku Teks
Dunn, Charles James
Putnam,, 1969
Buku Teks
Oskamp, Stuart, author
Lawrence Erlbaum , 2005
Buku Teks
Robert Maynard Hutchins, editor in chief
Encyclopaedia Britannica, Inc., 1952
Buku Referensi
O`Connell, D. P., author
The Law Book Company, 1971
Buku Teks