Myrdal, Gunnar, 1898-, author
Routledge & Kegan Paul, 1955
Buku Teks
Seth, M.L., author
S. Chand, 1969
Buku Teks
Walker, E. Ronald, author
University of Chicago Press, 1947
Buku Teks
Harrod, R.F., author
Macmillan, 1956
Buku Teks
Ropke, Wilhelm
Eugen Rentsch Verlag, 1961
Buku Teks