LEVIATHAN(S)…
Perform the research well. That is my standard.
You say “original book.” Since you failed to name it, or give citations or other specifics, concerns are that it possibly might not be the most valid source of information extant.
There has been much documentation gathered about this case in various media: books, reports, articles, recorded hypnosis sessions, and so on. Also a movie with Estelle Parsons as Betty Hill amongst the lot.
But for the sake accuracy and not lying or simply fabricating misleading words, I will just proffer two online references supporting information previously given:
@UFO CLEARINGHOUSE
“Betty engaged the beings in conversation and seemed to have more reign when aboard the craft.
She was shown a star map and given a book. After some conversations among the beings, it was decided that she would not be allowed to leave with the book.”
http://ufoclearinghouse.webs.com/classicufocases.htm@ALIEN UFO RESEARCH
“She had asked where they were from and they showed her a map of the star system and also
asked if she could take home a souvenir which they said yes and then changed there mind and
took back the book they were going to give her.”
http://alien-ufo-research.com/betty_and_barney_hill/