Não informado. (1960). Agriculture in Northern Ireland. Department of Agriculture.
Chicago-Zitierstil (17. Ausg.)Não informado. Agriculture in Northern Ireland. Belfast, Irlanda: Department of Agriculture, 1960.
MLA-Zitierstil (8. Ausg.)Não informado. Agriculture in Northern Ireland. Department of Agriculture, 1960.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.