Books by Herman S. Hettinger:
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Hettinger, Herman S. (Herman Strecker), 1902-1972: A Decade of Radio Advertising (Chicago: University of Chicago Press, c1933) (PDF at worldradiohistory.com)
Additional books by Herman S. Hettinger in the extended shelves:
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Hettinger, Herman S. (Herman Strecker), 1902-1972: Practical radio advertising (Prentice-Hall, 1938), also by Walter J. Neff (page images at HathiTrust; US access only)
Find more by Herman S. Hettinger at your library, or elsewhere.