Kleefstra, W. J. (1980). The concept of data model in database systems. s.n.].
Chicagoスタイル(17版)引用形式Kleefstra, Willem Johannes. The Concept of Data Model in Database Systems. [S.l.: s.n.], 1980.
MLA(8版)引用形式Kleefstra, Willem Johannes. The Concept of Data Model in Database Systems. s.n.], 1980.
警告: この引用は必ずしも正確ではありません.