Cita APA

Gregory, S. (1973). Statistical methods and the geographer (3a. ed.). [S.l.]: Longman.

Citación estilo Chicago

Gregory, S. Statistical Methods and the Geographer. 3a. ed. [S.l.]: Longman, 1973.

Cita MLA

Gregory, S. Statistical Methods and the Geographer. 3a. ed. [S.l.]: Longman, 1973.