Hollick, Ann L.
Princeton University press, 1981
Buku Teks
Magdoff, Harry
New York, N.Y. Monthly Review Press c.1969,
Buku Teks
Knauth, Oliver D.
Nasional Planning Association, 1960
Buku Teks
Higgins, Benjamin
Richard D. Irwin, 1962
Buku Teks
Shue, Henry
Princeton University press, 1980
Buku Teks