APA-referens (7:e uppl.)

Frnman, N., & Frnman, P. O. (1965). JWKB approximation: Contributions to the theory. North-Holland Publishing.

Chicago-referens (17:e uppl.)

Frnman, Nanny, och Per Olof Frnman. JWKB Approximation: Contributions to the Theory. Amsterdam: North-Holland Publishing, 1965.

MLA-referens (9:e uppl.)

Frnman, Nanny, och Per Olof Frnman. JWKB Approximation: Contributions to the Theory. North-Holland Publishing, 1965.