APA

,, . (1996). The first twenty-five years of the international patent classification 1971-1996. Geneva: World Intellectual Property Organization.

Chicago

,, . 1996. The first twenty-five years of the international patent classification 1971-1996. Geneva: World Intellectual Property Organization.

Harvard

,, . (1996). The first twenty-five years of the international patent classification 1971-1996. Geneva: World Intellectual Property Organization.

MLA

,, . The first twenty-five years of the international patent classification 1971-1996. Geneva: World Intellectual Property Organization. 1996.