These are the latest draft standard documents of 1997. The standardization effort has been abandoned; both of these drafts are withdrawn. The documents are still available for review, though. These are also the documents this work is based on.
The draft standard documents have kindly been made available by the IEEE for the public, and are available at http://wt.tuxomania.net/publications/posix.1e/. If this site should be unavailable, you can get copies of the 1003.1e and 1003.2c documents in pdf format from here.