Pigou, A.C. (Arthur Cecil), author
Macmillan, 1958
Buku Teks
Pease, Edward R., author
Frank Cass, 1963
Buku Teks
Hollis, Christopher, author
Hollis & Carter, 1949
Buku Teks
Penfold, John
Trentham Books, 1988
Buku Teks
London : Central Books Ltd
Majalah, Jurnal, Buletin