APA引文

Kwast, K. L. (1992). Unknown values in the relational database model. s.n.].

Chicago Style (17th ed.) Citation

Kwast, Karen Laura. Unknown Values in the Relational Database Model. [S.l.: s.n.], 1992.

MLA引文

Kwast, Karen Laura. Unknown Values in the Relational Database Model. s.n.], 1992.

警告：这些引文格式不一定是100％准确.