Greenberg, Jerald, author
Pearson, Prentice Hall, 2008
Buku Teks
edited by James L. Gibson
Tex Business Publications , 1982
Buku Teks
Etzioni, Amitai, author
Prentice-Hall, 1964
Buku Teks
Reitz, H. Joseph
richard D. Irwin, 1977
Buku Teks
Dunkerly, David
Routledge, 1972
Buku Teks