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I meant specifically on the AH-56A.

Edit: found a few:

A-10A development history (includes Johnson-McConnell agreement):

http://www.dtic.mil/dtic/tr/fulltext/u2/a530838.pdf

NDU paper on A-10 development:

http://www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA442118&Location=U2&doc=GetTRDoc.pdf

USMC paper on evolution of armed rotorcraft (claims AH-56 was unable to hover out of ground effect):

http://handle.dtic.mil/100.2/ADA491890

Good Army history on airpower in Vietnam:

http://handle.dtic.mil/100.2/ADA460480

USAF history on Army-Air Force cooperation

http://handle.dtic.mil/100.2/ADA181943

And what discussion would be complete without the inevitable Wikipedia article:

http://en.wikipedia.org/wiki/Johnson-McConnell_agreement_of_1966