APA (7th ed.) Citation

Migdal, A. B., & Leggett, A. J. (1969). Approximation methods in quantum mechanics. W.A.Benjamin.

Chicago Style (17th ed.) Citation

Migdal, A. B., and Anthony J. Leggett. Approximation Methods in Quantum Mechanics. New York: W.A.Benjamin, 1969.

MLA (8th ed.) Citation

Migdal, A. B., and Anthony J. Leggett. Approximation Methods in Quantum Mechanics. W.A.Benjamin, 1969.