1991 Manpower factbook. Research and Evaluation Division of the Office of Manpower Planning and Coordination.
Chicagoスタイル(17版)引用形式1991 Manpower Factbook. Metro Manila: Research and Evaluation Division of the Office of Manpower Planning and Coordination.
MLA(9版)引用形式1991 Manpower Factbook. Research and Evaluation Division of the Office of Manpower Planning and Coordination.
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