Não informado. (1960). Agriculture in Northern Ireland. Department of Agriculture.
Style de citation Chicago (17e éd.)Não informado. Agriculture in Northern Ireland. Belfast, Irlanda: Department of Agriculture, 1960.
Style de citation MLA (8e éd.)Não informado. Agriculture in Northern Ireland. Department of Agriculture, 1960.
Attention : ces citations peuvent ne pas être correctes à 100%.