APA

Dach G., Wegmann U., German Hard Coal Association, World Energy Congress (18th. : 2001 oct. 21-25 : Buenos Aires), Wegmann U. & German Hard Coal Association.Strategy of a global coal company for sustainable development. : .

Chicago

Dach Günter, Wegmann Ulrich, German Hard Coal Association, World Energy Congress (18th. : 2001 oct. 21-25 : Buenos Aires), Wegmann Ulrich and German Hard Coal Association.Strategy of a global coal company for sustainable development. : .

Harvard

Dach G., Wegmann U., German Hard Coal Association, World Energy Congress (18th. : 2001 oct. 21-25 : Buenos Aires), Wegmann U. and German Hard Coal Association.Strategy of a global coal company for sustainable development. : .

MLA

Dach Günter, Wegmann Ulrich, German Hard Coal Association, World Energy Congress (18th. : 2001 oct. 21-25 : Buenos Aires), Wegmann Ulrich and German Hard Coal Association.: . .