Quillen, Daniel G. Homotopical algebra / [by] Daniel G. Quillen. - Berlin ; New York [etc.] : Springer-Verlag, 1967. - 1 v. (various pagings) ; 28 cm. - Lecture notes in mathematics 43 . Bibliography: p. [6:19]-[6:20] Subjects--Topical Terms: Algebra, Homological.Homotopy theory.