United States. Bureau of Labor Statistics.
Hans-Joachim Braczyk
Carey Pratt McCord
India. Labour Bureau
National Union of Foundry Workers of Great Britain and Ireland.
Shiga-ken Kyōiku Iinkai. Bunkazai Hogoka
Hiroyasu Nakagawa
William Woodruff
Jens-Uwe Lemburg
Calman Robert Winegarden
Caspar Wittich
Chu, Quang Trứ
International Molders' and Foundry Workers' Union of North America
Hugh Anderson
Fritz Hauser
Universität Bielefeld. Fakultät für Soziologie
E. M. Kelsall
Great Britain
Robin Alan Williams