American Conference of Governmental Industrial Hygienists. (1991). Documentation of the threshold limit values and biological exposure indices (6th ed.). American Conference of Governmental Industrial Hygienists.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)American Conference of Governmental Industrial Hygienists. Documentation of the Threshold Limit Values and Biological Exposure Indices. 6th ed. Cincinnati, Ohio: American Conference of Governmental Industrial Hygienists, 1991.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)American Conference of Governmental Industrial Hygienists. Documentation of the Threshold Limit Values and Biological Exposure Indices. 6th ed. American Conference of Governmental Industrial Hygienists, 1991.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.