Go to My Favorite WEB Search Engine, and you'll find quite a few resources. DB Resources lists quite a few down the LEFT side (in Yellow, under Log Cabins.) Then, up above the Yellowed section, there's a DB Resources pull-down menu in which is a link for Stairs. Beyond the initial DB Resources link I listed, the WEB search found quite a few links for you.
I have to say that building stairs is an art that I respect quite a bit. It seems as though there's no such thing as a 'standard set of stairs'. Each and every one of them presents their own set of unique problems. I admire your interest in wanting to tackle such a job.