(1973). Water resources in England and Wales [peta]. London : HMSO.
Chicagoスタイル(17版)引用形式Water Resources in England and Wales [peta]. London : HMSO, 1973.
MLA(9版)引用形式Water Resources in England and Wales [peta]. London : HMSO, 1973.
警告: この引用は必ずしも正確ではありません.