Starch INRA Hooper (Firm) & United States Travel Service. Research and Analysis Division. Belgium: A study of the international travel market. The Division, c1978.
Cita Chicago (17th ed.)Starch INRA Hooper (Firm) i United States Travel Service. Research and Analysis Division. Belgium: A Study of the International Travel Market. [Washington: The Division, c1978.
Cita MLA (9th ed.)Starch INRA Hooper (Firm) i United States Travel Service. Research and Analysis Division. Belgium: A Study of the International Travel Market. The Division, c1978.
Atenció: Aquestes cites poden no estar 100% correctes.