APA ציטוט

Ullman, J. D. (1982). Principles of database systems. Rockville, Md: Computer Science Press.

Trích dẫn kiểu Chicago

Ullman, Jeffrey D. Principles of Database Systems. Rockville, Md: Computer Science Press, 1982.

ציטוט MLA

Ullman, Jeffrey D. Principles of Database Systems. Rockville, Md: Computer Science Press, 1982.