Open University. (1986). Open Learning. Longman Group.
Chicagoスタイル(17版)引用形式Open University. Open Learning. Essex, Inglaterra: Longman Group, 1986.
MLA(8版)引用形式Open University. Open Learning. Longman Group, 1986.
警告: この引用は必ずしも正確ではありません.
Open University. (1986). Open Learning. Longman Group.
Chicagoスタイル(17版)引用形式Open University. Open Learning. Essex, Inglaterra: Longman Group, 1986.
MLA(8版)引用形式Open University. Open Learning. Longman Group, 1986.