I wanna learn Pencil sketch, plz suggest sites/ebooks

I dont even know how draw these kind of drawings,
http://imageshack.us/photo/my-images/849/1227568f496.jpg
But eventually i want to learn drawing pencil sketch like the one below.
http://imageshack.us/photo/my-images/10/actors20pencil20art2028.jpg
Suggest me websites/ebooks to learn Pencil Sketching, like the above picture, I want it to be like step by step tutorial.
Answer #1
all your links dont work
Answer #2
sorry this was a double by mistake, while trying to fix the links above to display images.
i plz request the mods to do that for m, and then delete this post.
Answer #3
You need to post the Direct Link to your image Eg.
http://img849.imageshack.us/img849/4191/1227568f496.jpg
Then it will work with the [img] tags around it.
Do a Preview to test.
Answer #4
try to keep this one – – –
am sure you can pick some learning on this,
it’s an Andrew Loomis –
http://www30.zippyshare.com/v/29122296/file.html