Gaya APA

Briggs, D, J., M., I, C, F. (1989). Agriculture and environment the physical geography of temperate agricultural ì systems . London: London: Longman; 1989.

Gaya MLA

Briggs, David, J.., M., I., Courtney,, Frank. "Agriculture and environment the physical geography of temperate agricultural ì systems". London: London: Longman; 1989, 1989. Text.