APA (7th ed.) Citation

Frielink, A. B., Lehman, M. M., Knuth, D. E., Zahn, J., Purdy, J. G., & Urban, J. E. (1975). acm forum. Communications of the ACM, 18(6), 358.

Chicago Style (17th ed.) Citation

Frielink, A. B., M. M. Lehman, Donald E. Knuth, Jr Zahn, J. Gerry Purdy, and Joseph E. Urban. "Acm Forum." Communications of the ACM 18, no. 6 (1975): 358.

MLA (9th ed.) Citation

Frielink, A. B., et al. "Acm Forum." Communications of the ACM, vol. 18, no. 6, 1975, p. 358.