Goldstein, Joseph
The government of British trade unions : a study of apathy and the democratic process in the Transport and General Workers Union
Allen & Unwin, 1952
 Buku Teks
Kompassindo
Standard trade & industri directory of Indonesia
Jakarta : Kompassindo, 1994,
 Buku Referensi
Standard trade & industri directory of Indonesia
Kompassindo, 1994
 Buku Referensi
Standard trade & industri directory of Indonesia
Kompassindo, 1994
 Buku Referensi
Humphreys, Nick
Trade union law
Blackstone Press, 1999
 Buku Teks SO