Encounter '86 :
an international rendezvous with Halley's comet.
APA Citation
Longdon, N., European Space Agency. (1986). Encounter '86: an international rendezvous with Halley's comet. [Paris?]: European Space Agency.
MLA Citation
Longdon, Norman, and European Space Agency. Encounter '86: an International Rendezvous With Halley's Comet. [Paris?]: European Space Agency, 1986.
Warning: These citations may not always be complete (especially for serials).