GRAY, P. M. (1992). Object - Oriented Data Bases A Semantic Data Model Approach Peter M.d Gray, Krishwarao G. Kulkarni, Norman W. Paton. Prentice - Hall.
Čikaški stil citiranja (17. izdanje)GRAY, Peter M.D. Object - Oriented Data Bases A Semantic Data Model Approach Peter M.d Gray, Krishwarao G. Kulkarni, Norman W. Paton. Prentice - Hall, 1992.
MLA način citiranja (8. izdanje)GRAY, Peter M.D. Object - Oriented Data Bases A Semantic Data Model Approach Peter M.d Gray, Krishwarao G. Kulkarni, Norman W. Paton. Prentice - Hall, 1992.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.