International Vocational Training Information and Research Centre. (1969). Training of vocational teachers ([Rev. ed.].). CIRF Publications, ILO.

International Vocational Training Information and Research Centre. Training of Vocational Teachers. [Rev. ed.]. Geneva: CIRF Publications, ILO, 1969.

International Vocational Training Information and Research Centre. Training of Vocational Teachers. [Rev. ed.]. CIRF Publications, ILO, 1969.