Pigou, A. C.
Macmilan and Co., 1929
Buku Teks
Lee, Maurice W., author
Richard D. Irwin, 1967
Buku Teks
Link, Robert G., author
Columbia University Press, 1959
Buku Teks
Gordon, Robert Aaron, author
Harper & Brothers, 1952
Buku Teks
Roose, Kenneth D.
Yale University Press, 1954
Buku Teks