Huvudgrupp 1

• Bott, Raoul; Tu, Loring W., Differential forms in algebraic topology, New York, Springer, cop. 1982
• Milnor, John Willard; Weaver, David W., Topology from the differentiable viewpoint, Rev. ed., Princeton, N.J. ; a Chichester, Princeton Univ. Press, 1997
• Carmo, Manfredo Perdigão do, Differential forms and applications, Berlin, Springer-Vlg, cop. 1994
• Madsen, I. H.; Tornehave, Jørgen, From calculus to cohomology: De Rham cohomology and characteristic classes, Cambridge, Cambridge University Press, 1997