edited by Frances Cairncross and Phil Keeley
Methuen , 1981
Buku Teks
[publisher not identified], [date of publication not identified]
Buku Teks
Springer, 2012
eBooks
Malthus, T.R.
N.Y. Kelley & Millman , 1954
Buku Teks
Timmerman, Kelsey, author
Wiley, 2014
Buku Teks