Cita APA (7a ed.)

Barrett, R. A. (1989). Twentieth SIGCSE Technical Symposium on Computer Science Education. Association for Computing Machinery.

Cita Chicago Style (17a ed.)

Barrett, Robert A. Twentieth SIGCSE Technical Symposium on Computer Science Education. [Place of publication not identified]: Association for Computing Machinery, 1989.

Cita MLA (9a ed.)

Barrett, Robert A. Twentieth SIGCSE Technical Symposium on Computer Science Education. Association for Computing Machinery, 1989.