APA (7th ed.) Citation

Smith, J. O. (2007). Introduction to digital filters: With audio applications. W3K.

Chicago Style (17th ed.) Citation

Smith, Julius O. Introduction to Digital Filters: With Audio Applications. [S.l.]: W3K, 2007.

MLA (9th ed.) Citation

Smith, Julius O. Introduction to Digital Filters: With Audio Applications. W3K, 2007.

Warning: These citations may not always be 100% accurate.