Document name pincite, case citation (docket number), commercial database identifier (if you accessed the brief through WESTLAW, etc.)
Example: Brief for Ringling Bros.-Barnum & Bailey Combined Shows, Inc. et al. as Amici Curiae Supporting Respondents, Mosely v. V Secret Catalogue, Inc, 537 U.S. 418 (2003) (no. 01-1015), 2002 WL 1987618.
This citation does not look complete. I'm looking to cite some cases found on LexisNexis, but this doesn't look correct. I'm trying to cite this case: http://www.lexisnexis.com.wa.opal-libraries.org/lnacui2api/auth/checkbrowser.do?ipcounter=1&cookieState=0&rand=0.13110050316066613&bhjs=1&bhqs=1
But I'm unsure of what the case citation for this is, and this answer doesn't show how to finish the reference list citation (or maybe I'm not understanding).
For legal citations, the APA Handbook refers users to a book titled The Bluebook: A uniform system of citation. On page 106, the Bluebook gave what we have written down in this answer for citing briefs.
Unfortunately I was unable to open your Lexis Nexis link, but please email khutchison@walsh.edu if you are still having trouble. It could be that your citation feels incomplete because you're citing something that isn't a brief.