Smith, Robert J.
Stanford Univerisity Press, 1974
Buku Teks
Tareq Y. Ismail
Syracuses University Press, 1974
Buku Teks
Erica Harper, editor
international deveploment law organization, 2011
Buku Teks
Palmer, Monte
Thomson Wadsworth, 2007
Buku Teks
Bill, James A.
Littel Brown and Company, 1984
Buku Teks