Can I Put a CCK Text Field Value in Automatically Generated Title?

I created a CCK content type with several text fields:
field_book_title
field_book_author
field_book_publisher
etc...

I have the "automatic nodetitles" module automatically generating titles for me. Is there a way for me to have it use a CCK field value from that node? I tried entering [field_book_title] in the title pattern field, and it doesn't work. It just literally prints "[field_book_title]" as the title, including the square brackets.

Help!