APA (7th ed.) Citation

Koopman, B. O. (1977). Intuition in Mathematical Operations Research. Operations Research, 25(2), 189. https://doi.org/10.1287/opre.25.2.189

Chicago Style (17th ed.) Citation

Koopman, Bernard O. "Intuition in Mathematical Operations Research." Operations Research 25, no. 2 (1977): 189. https://doi.org/10.1287/opre.25.2.189.

MLA (9th ed.) Citation

Koopman, Bernard O. "Intuition in Mathematical Operations Research." Operations Research, vol. 25, no. 2, 1977, p. 189, https://doi.org/10.1287/opre.25.2.189.