Cave, M., Michie, J., & Slaa, P. (1992). Analysing Competition in International Telephone Service. IOS Press.
Lua i Stíl Chicago (17ú heag.)Cave, M., J. Michie, agus P. Slaa. Analysing Competition in International Telephone Service. IOS Press, 1992.
Lua MLA (9ú heag.)Cave, M., et al. Analysing Competition in International Telephone Service. IOS Press, 1992.
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