source: Bath Stone has been used extensively as a building material throughout southern England, for churches, houses, and public buildings such as railway stations.
target: Bath Stone has been used extensively as a building material throughout southern England.  It is used for churches, houses, and public buildings.  It is used for buildings such as railway stations.
references: Bath Stone has been used extensively as a building material throughout southern England.  It is used for churches, houses, and public buildings.  It is used for buildings such as railway stations.