edited by Mortimer J. Adler
Encyclopedia Britanica, 1990
Buku Referensi
edited by S.H. Steinberg
Funk & Wagnalls, 1954
Buku Referensi
Liswood, Laura A., author
Pandora, 1995
Buku Referensi
Barry Rodger, editor
Kluwer Law International , 2013
Buku Teks
Barrett, John, author
Allen & Unwin, 1995
Buku Teks