References: T. Ekedahl. Notes on
Stacks. Mittag-Leffler
Preprint 2006/07 No 69
Algebraic Stacks: Kai Behrend, Brian
Conrad, Dan Edidin, William Fulton, Barbara Fantechi, Lothar
Göttsche und Andrew Kresch.
Book in progress. Chapters
available here.
Champs
algébriques. Gerard Laumon and L. Moret-Bailly Pronk and Moerdijk.
Orbifolds, sheaves and groupoids.$K$-Theory 12
(1997), no. 1, 3--21
more references might be added. Homework: Any homework will be posted
here.