Pacific Asia Travel Association & Travel & Tourism Futures. (1998). German outbound report. Pacific Asia Travel Association.
Citazione stile Chigago Style (17a edizione)Pacific Asia Travel Association e Travel & Tourism Futures. German Outbound Report. [San Francisco]: Pacific Asia Travel Association, 1998.
Citatione MLA (8a ed.)Pacific Asia Travel Association e Travel & Tourism Futures. German Outbound Report. Pacific Asia Travel Association, 1998.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.