APA-viite (7. p.)
Geudens, T., & Costanzo, S. (2013). International voluntary service (Revised edition.). Council of Europe Publishing.
Chicago-viite (17. p.)
Geudens, Tony, ja Simona Costanzo. International Voluntary Service. Revised edition. Strasbourg, France: Council of Europe Publishing, 2013.
MLA-viite (9. p.)
Geudens, Tony, ja Simona Costanzo. International Voluntary Service. Revised edition. Council of Europe Publishing, 2013.
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