Organisation for Economic Co-operation and Development. Directorate for Scientific Affairs. (1968). Austria, Grece, Sweden.
Chicago-referens (17:e uppl.)Organisation for Economic Co-operation and Development. Directorate for Scientific Affairs. Austria, Grece, Sweden. [Paris], 1968.
MLA-referens (8:e uppl.)Organisation for Economic Co-operation and Development. Directorate for Scientific Affairs. Austria, Grece, Sweden. 1968.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.