International Labor Office, Geneva. (1924). Studies and reports, series I (Professional workers) no.1. s.n.
Citazione stile Chigago Style (17a edizione)International Labor Office, Geneva. Studies and Reports, Series I (Professional Workers) No.1. Geneva: s.n, 1924.
Citatione MLA (9a ed.)International Labor Office, Geneva. Studies and Reports, Series I (Professional Workers) No.1. s.n, 1924.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.