Google Play lists an email address for the basarafire dev:
basara0124@gmail.com
For Book Collection, just searching Google for the app name found me a message in a Kindle forum that pointed to this web site for info on the app:
http://fireapps.blogspot.com/p/book-...ndle-fire.html
It is true that not every developer wants to be bothered with questions and may not go out of their way to be accessible.
ApK