APA
Tsouros A. D., Efstathiou P. A., . (2007). Mass gatherings and public health. Copenhagen: WHO, Regional Office for Europe.
Chicago
Tsouros Agis D, Efstathiou Panos A, . 2007. Mass gatherings and public health. Copenhagen: WHO, Regional Office for Europe.
Harvard
Tsouros A. D., Efstathiou P. A., . (2007). Mass gatherings and public health. Copenhagen: WHO, Regional Office for Europe.
MLA
Tsouros Agis D, Efstathiou Panos A, . Mass gatherings and public health. Copenhagen: WHO, Regional Office for Europe. 2007.