In publications, this report should be referred to as:

IARC Helicobacter pylori Working Group (2014). Helicobacter pylori Eradication as a Strategy   for Preventing Gastric Cancer. Lyon, France: International Agency for Research on Cancer   (IARC Working Group Reports, No. 8). Available from: https://www.iarc.fr/en/publications/pdfs-online/wrk/wrk8/index.php

Example of how an individual chapter should be cited:

Wald NJ   (2014). The treatment of Helicobacter pylori infection of the stomach in   relation to the possible prevention of gastric cancer. In: IARC Helicobacter   pylori Working Group. Helicobacter pylori Eradication as a Strategy   for Preventing Gastric Cancer. Lyon, France: International Agency for Research   on Cancer (IARC Working Group Reports, No. 8); pp. 174-180. Available from: https://www.iarc.fr/en/publications/pdfs-online/wrk/wrk8/index.php