edited by Franklin D. Margiotta, James Brown, and Michael J. Collins
Westview Press, 1983
Buku Teks
Metz, Harold W.
The Brookings Institution, 1945
Buku Teks
Jakubuskas, Edward B.
Addison-Wesley, 1973
Buku Teks SO
Batubara, Cosmas
Departemen Tenaga Kerja RI, 1991
Buku Teks SO
Pechman, Joseph A.
Brookings Institution, 1971
Buku Teks