Ebbels, R.N., author
Landsdowne Press, 1965
Buku Teks
Mckinlay, Brian, author
Drummond, 1979
Buku Teks
Siedman, Joel
Labor Relation Cornel University, 1958
Buku Teks
Taff, Philip
Cornell University Press, 1958
Buku Teks
Litwack, Leon, author
Prentice-Hall, 1962
Buku Teks