International Labour Office & ebrary, Inc. (2011). Manual on the measurement of volunteer work. International Labour Office.
Citazione stile Chigago Style (17a edizione)International Labour Office e Inc ebrary. Manual on the Measurement of Volunteer Work. Genève, Switzerland: International Labour Office, 2011.
Citatione MLA (9a ed.)International Labour Office e Inc ebrary. Manual on the Measurement of Volunteer Work. International Labour Office, 2011.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.