Anselin, Luc, and John O’Loughlin. 1992. “Geography of international conflict and cooperation: spatial dependence and regional context in Africa.” The New Geopolitics, 39–75.

Bailey, Trevor C., and Anthony C. Gatrell. 1995. Interactive Spatial Data Analysis. England: Prentice Hall.

Dykes, J. A., and D. J. Unwin. 2001. “Maps of the Census: A Rough Guide.” In Case Studies of Visualization in the Social Sciences: Technical Report 43 (43): 29–54.

O’Sullivan, David, and David Unwin. 2010. Geographic Information Analysis. New Jersey, USA: Wiley.

Sun, M., and W.S. Wong. 2010. “Incorporating Data Quality Information in Mapping American Community Survey Data.” Cartography and Geography Information Science 37 (4): 285–300.

Tobler, Waldo R. 1970. “A Computer Movie Simulating Urban Growth in the Detroit Region.” Economic Geography 46 (2): 234–40.

Tukey, John W. 1972. “Some Graphic and Semigraphic Displays.” In Statistical Papers in Honor of George W. Snedecor, edited by T.A. Bancroft, 293–316. August 1969.