Meade, J.E., author
Oxford University Press, 1951
Buku Teks
Pastieau, Caroline
Canadian-American Comittee, 1974
Buku Teks
Griffith-Jones, Stephany
1998,
Buku Teks
Myrdal, Gunnar, 1898-, author
Yale University Press , 1960
Buku Teks
edited by Michael Stohl and Harry R. Targ
Schenkman Publishing Company, 1982
Buku Teks