International Association of Governmental Labour Officials. (1961). Labor laws and their administration: Proceedings of the Forty-fourth convention of the International Association of Governmental Labor Officials, held in Portland, Oregon, August 28-31, 1961. U.S. Government Printing Office.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)International Association of Governmental Labour Officials. Labor Laws and Their Administration: Proceedings of the Forty-fourth Convention of the International Association of Governmental Labor Officials, Held in Portland, Oregon, August 28-31, 1961. Washington D.C: U.S. Government Printing Office, 1961.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)International Association of Governmental Labour Officials. Labor Laws and Their Administration: Proceedings of the Forty-fourth Convention of the International Association of Governmental Labor Officials, Held in Portland, Oregon, August 28-31, 1961. U.S. Government Printing Office, 1961.