Cita APA (7th ed.)

Berry, S., Carvall, M., & Spiller, P. T. (1996). Airline hubs: Costs, markups and the implications of customer heterogeneity. National Bureau of Economic Research.

Cita Chicago (17th ed.)

Berry, Steven, Michael Carvall, i Pablo T. Spiller. Airline Hubs: Costs, Markups and the Implications of Customer Heterogeneity. Cambridge: National Bureau of Economic Research, 1996.

Cita MLA (9th ed.)

Berry, Steven, et al. Airline Hubs: Costs, Markups and the Implications of Customer Heterogeneity. National Bureau of Economic Research, 1996.