Douma, Sytse
Prentice-Hall, 2002
Buku Teks
Blau, Peter M., author
Routledge & Kegan Paul, 1966
Buku Teks
Blau, Peter M., author
Routledge & Kegan Paul, 1963
Buku Teks
Dessler, Gary, 1942-, author
Prentice-Hall, 1976
Buku Teks
edited by James G. March
Rand McNally, 1965
Buku Teks