Cita APA

National Academy of Sciences. (1973). Geographical Perspectives and urban problems. [S.l.]: [s.n.].

Citación estilo Chicago

National Academy of Sciences. Geographical Perspectives and Urban Problems. [S.l.]: [s.n.], 1973.

Cita MLA

National Academy of Sciences. Geographical Perspectives and Urban Problems. [S.l.]: [s.n.], 1973.