Ulrichsen, Kristian, author
Palgrave Macmillan, 2016
Buku Teks
Castles, Francis G.
Allen & Unwin, 1985
Buku Teks
Scitovsky, Tibor
Richard D. Irwin, 1951
Buku Teks
Musolf, Lloyd D.
Scott, Foresman and Company, 1965
Buku Teks
edited by Ian R. Edgar and Andrew Russell
Routledge, 1998
Buku Teks