Cita APA (7a ed.)

Bergström, R., & Steenmans, C. (1998). Land cover: Annual topic update 1997. Office for Official Publications of the European Communities.

Cita Chicago Style (17a ed.)

Bergström, Rolf, y Chris Steenmans. Land Cover: Annual Topic Update 1997. Luxembourg: Office for Official Publications of the European Communities, 1998.

Cita MLA (9a ed.)

Bergström, Rolf, y Chris Steenmans. Land Cover: Annual Topic Update 1997. Office for Official Publications of the European Communities, 1998.