The Comet Halley dust & gas environment :
proceedings of a joint NASA/ESA working group meeting, Heidelberg, 26 and 27 August 1981.

APA Citation

European Space Agency., United States. National Aeronautics and Space Administration. (1981). The Comet Halley dust & gas environment: proceedings of a joint NASA/ESA working group meeting, Heidelberg, 26 and 27 August 1981. Paris, France: European Space Agency.

MLA Citation

European Space Agency, and United States. National Aeronautics and Space Administration. The Comet Halley Dust & Gas Environment: Proceedings of a Joint NASA/ESA Working Group Meeting, Heidelberg, 26 And 27 August 1981. Paris, France: European Space Agency, 1981.