International Labour Office & ebrary, Inc. (2011). Manual on the measurement of volunteer work. International Labour Office.
芝加哥风格引文International Labour Office 与 Inc ebrary. Manual on the Measurement of Volunteer Work. Genève, Switzerland: International Labour Office, 2011.
MLA引文International Labour Office 与 Inc ebrary. Manual on the Measurement of Volunteer Work. International Labour Office, 2011.
警告：这些引文格式不一定是100％准确.