Não informado. (1940). Labor market and employment security. Bureau of Employment Security.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Labor Market and Employment Security. Washington: Bureau of Employment Security, 1940.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Labor Market and Employment Security. Bureau of Employment Security, 1940.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.