This item is from the Yet Another Enhanced IDE/Fast-ATA/ATA-2 FAQ, by John Wehman and Peter den Haan with numerous contributions by others. (v1.92).
Unfortunately, this lists consistently eludes being entirely up to date, but it should get you started.
o AT Attachment Interface for Disk Drives, ANSI X3.221-1994, Approved May 12, 1994.
o AT Attachment Interface with Extensions (ATA-2), ANSI ASC X3.279-1996, revision 3, proposed American National Standard 948D.
o AT Attachment-3 Interface (ATA-3), ANSI ASC X3.298-199x.
o AT Attachment-4 Interface (ATA-4), X3T13 draft.
o ATA packet Interface for CD-ROMs, SFF-8020, Revision 1.2, June 13 1994.
o Western Digital Enhanced IDE Implementation Guide, by Western Digital Corporation, revision 5.0.
o Fast ATA Sourcebook, Quantum Corporation, November 1994.
o Enhanced Disk Drive Specification, by Phoenix Technologies Ltd., version 1.1, January 95.