Cita APA (7a ed.)

Hopcroft, J. E., Friedman, E. P., & Harrison, M. A. (1977). Proceedings of the ninth annual ACM symposium on Theory of computing. Association for Computing Machinery.

Cita Chicago Style (17a ed.)

Hopcroft, John E., Emily P. Friedman, y Michael A. Harrison. Proceedings of the Ninth Annual ACM Symposium on Theory of Computing. New York, New York: Association for Computing Machinery, 1977.

Cita MLA (9a ed.)

Hopcroft, John E., et al. Proceedings of the Ninth Annual ACM Symposium on Theory of Computing. Association for Computing Machinery, 1977.