APA (7th ed.) Citation

Garwick, J. V., & Reynolds, J. C. (1968). GPL, a Truly General Purpose Language. Communications of the ACM, 11(9), 634. https://doi.org/10.1145/364063.364092

Chicago Style (17th ed.) Citation

Garwick, Jan V., and J. C. Reynolds. "GPL, a Truly General Purpose Language." Communications of the ACM 11, no. 9 (1968): 634. https://doi.org/10.1145/364063.364092.

MLA (9th ed.) Citation

Garwick, Jan V., and J. C. Reynolds. "GPL, a Truly General Purpose Language." Communications of the ACM, vol. 11, no. 9, 1968, p. 634, https://doi.org/10.1145/364063.364092.