Owen, Robert
J.M. Dent & Sons , 1949
Buku Teks
Kenen, Peter B., author
Institute for International Economics , 2001
Buku Teks
Fitzgerald, C.P.
Oxford University Press, 1965
Buku Teks
editor, Lawrence R. Frey
Sage, 2002
Buku Teks
Singapura Intellectual Puclishing [t.th.]
Buku Referensi