Cita APA (7th ed.)

Geudens, T., & Costanzo, S. (2013). International voluntary service (Revised edition.). Council of Europe Publishing.

Cita Chicago (17th ed.)

Geudens, Tony, i Simona Costanzo. International Voluntary Service. Revised edition. Strasbourg, France: Council of Europe Publishing, 2013.

Cita MLA (9th ed.)

Geudens, Tony, i Simona Costanzo. International Voluntary Service. Revised edition. Council of Europe Publishing, 2013.