1: Case No. 561 – David Knight, as I’m sure most of you know, was Richard S. Prather.
2-5: Richard Deming was a novelist who also did tie-ins. A number of Mod Squad novels followed these two paperback novels and a Whitman hardcover which was a set of short stories. The second Whitman hardcover with Harry Morgan on the cover, covering the second version of the TV series, is essentially the same book as the earlier minus a couple of the stories and the Frank Smith character changed to Bill Gannon.
6: The paperback novel based on the second version of the series.