APA (7th ed.) Citation

Balas, E., & Padberg, M. W. (1972). On the Set-Covering Problem. Operations Research, 20(6), 1152. https://doi.org/10.1287/opre.20.6.1152

Chicago Style (17th ed.) Citation

Balas, Egon, and Manfred W. Padberg. "On the Set-Covering Problem." Operations Research 20, no. 6 (1972): 1152. https://doi.org/10.1287/opre.20.6.1152.

MLA (9th ed.) Citation

Balas, Egon, and Manfred W. Padberg. "On the Set-Covering Problem." Operations Research, vol. 20, no. 6, 1972, p. 1152, https://doi.org/10.1287/opre.20.6.1152.