Siedman, Joel
Labor Relation Cornel University, 1958
Buku Teks
Litwack, Leon
Prentice-Hall, 1962
Buku Teks SO
Ebbels, R.N.
Landsdowne Press, 1965
Buku Teks SO
Silaban, Rekson
Friedrich Ebert Stiftng, 2009
Buku Teks SO
[publisher not identified], 1957
Buku Teks