If a publication is issued by an organization and carries no personal author's name, list it as the author.
Please note that Chicago now omits the place of publication for books published after 1900 (see the Manual, 14.30). For books published before 1900, they recommend using the place of publication instead of the publisher itself, as it is of greater interest (see the Manual, 14.31).
Example 1 – Organization as Author
N: 1. World Health Organization, WHO Editorial Style Manual (World Health Organization, 1993), 83-91.
B: World Health Organization. WHO Editorial Style Manual. World Health Organization, 1993.