A publisher is a person, firm, or corporate body that makes a work available to the public.
The publisher is placed after the title. When using the citation-sequence and the citation-name systems end the publisher information with a semicolon. Use a period when using the name-year system. When using a journal or newspaper title as the publisher's name a period is used in all three systems.
Here are the general guidelines for including publisher titles in the references list.
From CSE Manual 9th ed., Ch. 29.3.3.5 Publisher