Possible Romita cover credit provided 2006 by Nick Caputo. Background art is clipped from the interior story. Cover credits confirmed 2009 on the error list via The Official Marvel Index to the Avengers #3 (Marvel Comics, Oct. 1987), p. 22.
Contents page includes images from interior stories. Credits include Roy Thomas, Sol Brodsky, John Verpoorten and Sharon Kay.
Inkers who assisted Adkins likely include Tom Palmer (pages 2-3); Dick Ayers (pages 16, 17, 20) and Paul Reinman (page 22). Alterations by other artists are noticable throughout the book, including Marie Severin, Herb Trimpe and John Romita, who redrew Dane Whitman's face throughout most of the story. Info per Nick Caputo, March 2013. Black Knight's appearance takes place in between AVENGERS #55-60.
letters section includes Black Knight image from opening story and promo for the next issue.