Citazione Stile APA (7a Edizione)

Fröman, N., & Fröman, P. O. (2002). Physical problems solved by the phase-integral method. Cambridge University Press.

Citazione stile Chigago Style (17a edizione)

Fröman, Nanny, e Per Olof Fröman. Physical Problems Solved by the Phase-integral Method. Cambridge ; New York: Cambridge University Press, 2002.

Citatione MLA (9a ed.)

Fröman, Nanny, e Per Olof Fröman. Physical Problems Solved by the Phase-integral Method. Cambridge University Press, 2002.