There are not a lot of books on or in Inuktitut but there are a few:
Inuit Nunamiut: Inland Inuit
. Ed. and compiler, Hattie Mannik. This is a wonderful book of reminiscences of some of Baker Lake's elders. The stories are written in Inuktitut and translated to English. Available from the Baker Lake Inuit Heritage Centre.
The best source for books is from the library of Nunavut Arctic College
. They sell books about Inuktitut as well as a fabulous series of Inuit traditional knowledge Interviewing Inuit Elders. These are available as books in either Inuktitut or English.Some of the English translations are available online and they promise to put the actual oral interviews online as sound files in the future.