APA
United Nations Centre for Human Settlements, . (1991). Micro-computer based GIS 1991. Nairobi: UNCHS (Habitat).
Chicago
United Nations Centre for Human Settlements, . 1991. Micro-computer based GIS 1991. Nairobi: UNCHS (Habitat).
Harvard
United Nations Centre for Human Settlements, . (1991). Micro-computer based GIS 1991. Nairobi: UNCHS (Habitat).
MLA
United Nations Centre for Human Settlements, . Micro-computer based GIS 1991. Nairobi: UNCHS (Habitat). 1991.