Não informado. (1960). Agriculture in Northern Ireland. Department of Agriculture.
Cita Chicago Style (17a ed.)Não informado. Agriculture in Northern Ireland. Belfast, Irlanda: Department of Agriculture, 1960.
Cita MLA (8a ed.)Não informado. Agriculture in Northern Ireland. Department of Agriculture, 1960.
Precaución: Estas citas no son 100% exactas.