Basic information about licence

Hi, i'm new using adobe stock, so i'd like to have some basic information about the use of photos. I've signed up for a monthlt subscription, so i can download 10 photos. I want to use this photos in a book that i'm writing, so i want to know: i have to write something under the photos like the name of the author? Moreover, where can i see the licence (can i have a written licence or where can i find the licence? Thank you