Παραπομπή σε μορφή APA (7η εκδ.)

Starch INRA Hooper (Firm) & United States Travel Service. Research and Analysis Division. Belgium: A study of the international travel market. The Division, c1978.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Starch INRA Hooper (Firm) και United States Travel Service. Research and Analysis Division. Belgium: A Study of the International Travel Market. [Washington: The Division, c1978.

Παραπομπή σε μορφή MLA (9th εκδ.)

Starch INRA Hooper (Firm) και United States Travel Service. Research and Analysis Division. Belgium: A Study of the International Travel Market. The Division, c1978.