Those choices will work fine. So far since starting GC, I've direct learned from about 20 books on sales/communication/persuasion.
I just hop on over to the library for about 20-30 minutes and photoread a couple times a week.
After you do this, you'll be less concerned with whether or not the specific books you've chosen are ideal or not, since you can learn from most books.
Good luck.
George
