Gopalakrishnan. (1982). Materials management. Prentice Hall of India.
Lua i Stíl Chicago (17ú heag.)Gopalakrishnan. Materials Management. New Delhi: Prentice Hall of India, 1982.
Lua MLA (9ú heag.)Gopalakrishnan. Materials Management. Prentice Hall of India, 1982.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.