APA
World Intellectual Property Organization (WIPO), . (2006). Official catchword index to the eighth edition (2006) of the international patent classification. Geneva: World Intellectual Property Organization (WIPO).
Chicago
World Intellectual Property Organization (WIPO), . 2006. Official catchword index to the eighth edition (2006) of the international patent classification. Geneva: World Intellectual Property Organization (WIPO).
Harvard
World Intellectual Property Organization (WIPO), . (2006). Official catchword index to the eighth edition (2006) of the international patent classification. Geneva: World Intellectual Property Organization (WIPO).
MLA
World Intellectual Property Organization (WIPO), . Official catchword index to the eighth edition (2006) of the international patent classification. Geneva: World Intellectual Property Organization (WIPO). 2006.