Harrison, B., & Sum, A. (1979). Labor market data needs from the perspective of "dual" or "segmented" labor market research. National Commission on Employment and Unemployment Statistics : for sale by the Supt. of Docs., U.S. Govt. Print. Off..
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Harrison, Bennett, و Andrew Sum. Labor Market Data Needs from the Perspective of "Dual" or "Segmented" Labor Market Research. Washington: National Commission on Employment and Unemployment Statistics : for sale by the Supt. of Docs., U.S. Govt. Print. Off., 1979.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Harrison, Bennett, و Andrew Sum. Labor Market Data Needs from the Perspective of "Dual" or "Segmented" Labor Market Research. National Commission on Employment and Unemployment Statistics : for sale by the Supt. of Docs., U.S. Govt. Print. Off., 1979.