1. Foundations of Differential Geometry, Vol. 1;Kobayashi,1963
2. Synthetic Differential Geometry;Kock,1981
3. Strong infinitesimal linearity, with applications to strong difference and affine connections;Kock;Cahiers de Topologie et Géométrie Différentielle,1984
4. Basic Concepts of Synthetic Differential Geometry;Lavendhomme,1996
5. Differential forms in synthetic differential geometry;Lavendhomme;Internat. J. Theoret. Phys.,1998