When referencing a publication by a corporate author in the body of your paper, you need to include both the name of the corporate body/organization (do not abbreviate) and the page number(s) you drew the information from.
If there is a word such as "A", "An", or "The" at the beginning of the name of a corporate author, it may be omitted in both the Parenthetical Citation and the Works Cited entry.
If the name of the corporation/organization is quite long, it is often better to put the name in the sentence leading up to the citation.
E.g. In 1963 the United Nations Economic Commission for Africa predicted that Africa would evolve into an advanced industrial economy within fifty years (1-2, 4-6).
(Organization Name page number)
(Natl. Research Council 55)