Frnman, N., & Frnman, P. O. (1965). JWKB approximation: Contributions to the theory. North-Holland Publishing.
Chicago Style (17. basım) AtıfFrnman, Nanny, ve Per Olof Frnman. JWKB Approximation: Contributions to the Theory. Amsterdam: North-Holland Publishing, 1965.
MLA (9th ed.) AtıfFrnman, Nanny, ve Per Olof Frnman. JWKB Approximation: Contributions to the Theory. North-Holland Publishing, 1965.
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