Παραπομπή σε μορφή APA (7η εκδ.)

WFSF World Conference : Budapest & World Futures Studies Federation. (1990). Summaries of the group sessions' reports, the 11th WFSF Word Conference: May 31, 1990 Budapest. [s.n.].

Παραπομπή σε μορφή Chicago (17η εκδ.)

WFSF World Conference : Budapest και World Futures Studies Federation. Summaries of the Group Sessions' Reports, the 11th WFSF Word Conference: May 31, 1990 Budapest. [s.l.]: [s.n.], 1990.

Παραπομπή σε μορφή MLA (9th εκδ.)

WFSF World Conference : Budapest και World Futures Studies Federation. Summaries of the Group Sessions' Reports, the 11th WFSF Word Conference: May 31, 1990 Budapest. [s.n.], 1990.