1. Sur l'extension de l'ordre partiel;Szpilrajn;Fundam. Math.,1930
2. Abstract homotopy. III;Kan;Proc. Natl. Acad. Sci.,1956
3. Homotopical Algebra;Quillen,1967
4. Calculus of Fractions and Homotopy Theory;Gabriel,1967
5. On the operads of J.P. May;Maxwell Kelly;Reprints Theory Appl. Categ.,2005