This book was told to Alex Haley by Malcolm X - would I be correct saying Malcolm X was the author or should I say Alex Haley?I understand that...

Looking at the front cover will generally list the
author's name.  If you look on the spine of the book, it usually gives the title in
larger print, and the author's name below it.

If the book
is an autobiography, it is usually written by the person who the story is about, and it
will generally have his/her name; beneath it there will often be a note "with......"  In
this case it seems that Alex Haley assembled the book (no easy task) based on interviews
conducted with Malcolm X, and then wrote the epilogue and closing notes after Malcolm
X's assassination.

Haley has been described on some sites
as the "coauthor."

However, on the book covers I looked at
on Amazon.com, the covers all appear to say the same
thing:

The Autobiography of Malcolm X: As Told to
Alex Haley by Malcolm
X

Though Alex Haley took Malcolm
X's words and put them to paper, the work, the ideas, the language were Malcolm X's.
 The word "auto-" meaning "self," so I would use Malcolm X as the
author.