APA (7th ed.) Citation

Simmonds, J. G., & Mann, J. E. (1998). A first look at perturbation theory (2nd ed.). Dover Publications.

Chicago Style (17th ed.) Citation

Simmonds, James G., and James E. Mann. A First Look at Perturbation Theory. 2nd ed. New York: Dover Publications, 1998.

MLA (8th ed.) Citation

Simmonds, James G., and James E. Mann. A First Look at Perturbation Theory. 2nd ed. Dover Publications, 1998.