APA (7th ed.) Citation

Epstein, J. M. (2008). Why Model? Journal of Artificial Societies & Social Simulation, 11(4), 4.

Chicago Style (17th ed.) Citation

Epstein, Joshua M. "Why Model?" Journal of Artificial Societies & Social Simulation 11, no. 4 (2008): 4.

MLA (9th ed.) Citation

Epstein, Joshua M. "Why Model?" Journal of Artificial Societies & Social Simulation, vol. 11, no. 4, 2008, p. 4.