GRAY, P. M. (1992). Object-oriented Databases: A Semantic Data Model Approach / Peter M.d. Gray, Krishnarao G. Kulkarni And Norman W. Paton. Prentice Hall.
Lua i Stíl Chicago (17ú heag.)GRAY, Peter M.D. Object-oriented Databases: A Semantic Data Model Approach / Peter M.d. Gray, Krishnarao G. Kulkarni And Norman W. Paton. Prentice Hall, 1992.
Lua MLA (8ú heag.)GRAY, Peter M.D. Object-oriented Databases: A Semantic Data Model Approach / Peter M.d. Gray, Krishnarao G. Kulkarni And Norman W. Paton. Prentice Hall, 1992.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.