Silverman, Max, author
Routledge, 1999
Buku Teks
Lechte, John, author
Roudledge, 1994
Buku Referensi
Herod, Andrew, author
Willey Black well, 2009
Buku Teks
Bhagwati, Jagdish, author
Oxford University Press, 2004
Buku Teks
edited by Aseem Prakash and Jeffrey A. Hart
Routledge, 1999
Buku Teks