Starch INRA Hooper (Firm) & United States Travel Service. Research and Analysis Division. Belgium: A study of the international travel market. The Division, c1978.
芝加哥风格引文Starch INRA Hooper (Firm) 与 United States Travel Service. Research and Analysis Division. Belgium: A Study of the International Travel Market. [Washington: The Division, c1978.
MLA引文Starch INRA Hooper (Firm) 与 United States Travel Service. Research and Analysis Division. Belgium: A Study of the International Travel Market. The Division, c1978.
警告：这些引文格式不一定是100％准确.