Não informado. (1960). Agriculture in Northern Ireland. Department of Agriculture.
Chicagoスタイル(17版)引用形式Não informado. Agriculture in Northern Ireland. Belfast, Irlanda: Department of Agriculture, 1960.
MLA(8版)引用形式Não informado. Agriculture in Northern Ireland. Department of Agriculture, 1960.
警告: この引用は必ずしも正確ではありません.