Cita APA (7a ed.)

Rachev, B., Rachev, B. C., & Smrikarov, A. C. (2003). Proceedings of the 4th International Conference Conference on Computer Systems and Technologies: E-Learning. ACM.

Cita Chicago Style (17a ed.)

Rachev, B., Boris Contributor Rachev, y Angel Contributor Smrikarov. Proceedings of the 4th International Conference Conference on Computer Systems and Technologies: E-Learning. [Place of publication not identified]: ACM, 2003.

Cita MLA (9a ed.)

Rachev, B., et al. Proceedings of the 4th International Conference Conference on Computer Systems and Technologies: E-Learning. ACM, 2003.