Hello, one week now I am trying to find some information on internet and libraries for the church of San Lorenzo in Milan, Italy. So far I haven't found anything. But, some information in Wikipedia is not what I am looking for. I need to find plan, elevation, section ect. ,so as I can draw it, and generally the history. I am a student and I have an assigment to do. Can anyone direct me where I have to look? What books to read? Where I can find the informations that I need? 

Thank you!