Janelle, D. G., Warf, B., & Hansen, K. (2004). Worldminds. Geographical perspectives on 100 problems: Commemorating the 100th anniversary of the Association of American Geographers 1904-2004 (1a. ed.). Kluwer Academic.

Janelle, Donald G., Barney Warf, and Kathy Hansen. Worldminds. Geographical Perspectives on 100 Problems: Commemorating the 100th Anniversary of the Association of American Geographers 1904-2004. 1a. ed. Dordrecht: Kluwer Academic, 2004.

Janelle, Donald G., et al. Worldminds. Geographical Perspectives on 100 Problems: Commemorating the 100th Anniversary of the Association of American Geographers 1904-2004. 1a. ed. Kluwer Academic, 2004.