Dey, B. (1988). Quality circles: Concept and practices. Macmillian India.
Lua i Stíl Chicago (17ú heag.)Dey, B. Quality Circles: Concept and Practices. Delhi: Macmillian India, 1988.
Lua MLA (9ú heag.)Dey, B. Quality Circles: Concept and Practices. Macmillian India, 1988.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.