The names of groups that serve as authors (e.g., corporations, associations, government agencies, and study groups) are usually spelled out each time they appear in a text citation. If there are three or more authors, include the last name of only the first author followed by "et al.":. as has been shown (James & Ryerson, 1999). 
as James and Ryerson (1999) demonstrated.
If there are two authors, include the last name of each and the publication year:. Within a paragraph, you need not include the year in subsequent references. In most cases, providing the author's last name and the publication year are sufficient:.
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