Dead Link on Help Page for "Screenplay" and "Written by" Credits

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On the IMDb help page:
http://www.imdb.com/help/search?domain=helpdesk_faq&index=1&file=writerterms

What is the difference between "Screenplay" and "Written by" credits?
The Screenplay credit is normally used when there's a separate credit for the Story writer.

When the same writer is the author of both Story and Screenplay, the 'Written by' term is used.

For more details, please see the official definitions from the Writers Guild of America.

official definitions links to http://wga.org/subpage_writersresources.aspx?id=171 This link no longer exists and produces a page not found (404) error.

Unfortunately, I was unable to find a newer version of the page on the Writers Guild of America site.