UM OAYK NOUMBA. (2004). MODEL FOR CALCULATING INTERCONNECTION COSTS IN TELECOMMUNICATIONS - CD. WORLD BANK.
Chicago Style aipamenaUM OAYK NOUMBA. MODEL FOR CALCULATING INTERCONNECTION COSTS IN TELECOMMUNICATIONS - CD. WASHINGTON: WORLD BANK, 2004.
MLA aipamenaUM OAYK NOUMBA. MODEL FOR CALCULATING INTERCONNECTION COSTS IN TELECOMMUNICATIONS - CD. WORLD BANK, 2004.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.