Valencia, L. B. (2001). Hubs and spokes tourism strategy. Manila Bulletin.
Cita Chicago Style (17a ed.)Valencia, Lynda B. "Hubs and Spokes Tourism Strategy." Manila Bulletin 2001.
Cita MLA (9a ed.)Valencia, Lynda B. "Hubs and Spokes Tourism Strategy." Manila Bulletin, 2001.
Precaución: Estas citas no son 100% exactas.