APA
Knowles I. W. (., Lewis R. T. (., . (1981). Spectral theory of differential operators. New York: North Holland Publishing Company.
Chicago
Knowles Ian W (Ed.), Lewis Rogert T (Ed.), . 1981. Spectral theory of differential operators. New York: North Holland Publishing Company.
Harvard
Knowles I. W. (., Lewis R. T. (., . (1981). Spectral theory of differential operators. New York: North Holland Publishing Company.
MLA
Knowles Ian W (Ed.), Lewis Rogert T (Ed.), . Spectral theory of differential operators. New York: North Holland Publishing Company. 1981.
