APA
Association for Geographic Information, . (1990). AGI 90: GIS - the key to managing information: second national conference and exhibition...Brighton... 22-24 October 1990. London: Association for Geographic Information.
Chicago
Association for Geographic Information, . 1990. AGI 90: GIS - the key to managing information: second national conference and exhibition...Brighton... 22-24 October 1990. London: Association for Geographic Information.
Harvard
Association for Geographic Information, . (1990). AGI 90: GIS - the key to managing information: second national conference and exhibition...Brighton... 22-24 October 1990. London: Association for Geographic Information.
MLA
Association for Geographic Information, . AGI 90: GIS - the key to managing information: second national conference and exhibition...Brighton... 22-24 October 1990. London: Association for Geographic Information. 1990.
