I am currently writing a book on American Pit Bull Terriers and my first source is a book by Elaine Waldorf Gewirtz. I plan to include her book in my list of resources but do I have to ask permission first if I am not taking things from it word for word? Just info that I could get from several places (like the breed description and breed standards). I am also taking notes on care and training info from this book (will be getting it from other sources). Should I contact the book publisher and ask permission to use as a source?