Knoop, Todd A., author
Blackwell Pub., 2008
Buku Teks
Cambridge University Press, 2019
eBooks
Schiff, Peter D., author
John Wiley and Sons, 2010
Buku Teks
Pigou, A. C.
Macmilan and Co., 1929
Buku Teks
Roose, Kenneth D.
Yale University Press, 1954
Buku Teks