Screenplay PDF
http://www.hollywoodchicago.com/uploaded_images/therewillbeblood_script.pdf
A PDF of There Will Be Blood's screenplay by Paul Thomas Anderson. Includes some scenes not used in the final film and some dialogue which is slightly different from the dialogue in the final film.
Oil! PDF
https://archive.org/details/oilnovel0000sinc
A publicly available PDF of Upton Sinclair's original novel, Oil!, which served as the inspiration for There Will Be Blood.
Yale Film Analysis Guide
https://filmanalysis.coursepress.yale.edu/
Guide on Film Analysis terminology.
There Will Be Blood IMDB
https://www.imdb.com/title/tt0469494/
Repository of cast and crew members, pictures, trailers, trivia, and more.