International Labour Office & ebrary, Inc. (2011). Manual on the measurement of volunteer work. International Labour Office.
Chicagoスタイル(17版)引用形式International Labour Office , Inc ebrary. Manual on the Measurement of Volunteer Work. Genève, Switzerland: International Labour Office, 2011.
MLA(9版)引用形式International Labour Office , Inc ebrary. Manual on the Measurement of Volunteer Work. International Labour Office, 2011.
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