Lowi, Theodore J.
Macmillan, 1976
Buku Teks
Ziegler, Raymond J.
Appleton-Century-Crofts, 1966
Buku Teks
Russel Sage Foundation, 1997
Buku Teks
Hodgetts, Richard M., author
Saunders, 1977
Buku Teks
Sethi, S. Prakash, author
Prentice-Hall, 1974
Buku Teks