A few questtions before I get started

I am hoping to record some stories in Punjabi from dual language books.
My Q?
Am I able to use stories in English from the web that already exist and translate them?? and then add some comprehension questions??
If yes, then how do I get permission ??
For example if I want to translate a story from
http://www.kindersite.org/Directory/DirectoryFrame.htm
(sorry I forgot how to make this an active link)
There is so much that already exists on the web with animated pictures and I am hoping not to reinvent the wheel!!