Madsen, I. H., & Tornehave, J. (1997). From calculus to cohomology: De Rham cohomology and characteristic classes. Cambridge University Press.

Madsen, I. H., and Jørgen Tornehave. From Calculus to Cohomology: De Rham Cohomology and Characteristic Classes. Cambridge ; New York: Cambridge University Press, 1997.

Madsen, I. H., and Jørgen Tornehave. From Calculus to Cohomology: De Rham Cohomology and Characteristic Classes. Cambridge University Press, 1997.