Blake, Barry J.
Relational grammar
Routledge, 1990
 Buku Teks SO
Whitehorn, Mark
Seluk beluk database relasional=Inside relational databases
Erlangga, 2003
 Buku Teks
Müller, M.E.
Relational knowledge discovery
Cambridge University Press, 2012
 eBooks
Hadi Kusalamwardi
Normalisasi Suatu Bentuk Relational Data Base
Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Indonesia, 1985
 UI - Skripsi Membership
Codd, E.F.
The relational model for database management: version 2
Addison-Wesley, 1990
 Buku Teks