There are some really useful books about cat behaviour - Bruce Fogle - a qualified vet - has written many, If Your Cat Could Talk, The Cat's Mind, etc.
There is also a great new one Cat Sense: The Feline Enigma Revealed by Dr John Bradshaw, an academic at a top UK university, who recently was on a BBC TV Horizon programme.
Personally, I get tired on TV, and never trust the presenters (maybe because I used to work in the medium and know how things work!)
After all, how qualified are the presenters on TV who tell people how to live and dispense advice like ancient oracles?
And even if these people call themselves doctors, are they 'real' doctors at all anyway, or have they just bought a certificate ('stiffy-cat!) from some fake university? There have been some bad cases of that in the UK.
For a more light-hearted approach, there are some fiction books that reveal cat behaviour - and movies too (watch Figaro in Disney's Pinocchio!). I tried to get under the fur of cats in my own funny novel A Cat Called Dog - though I took a lot of poetic licence too (after all, I wrote a novel not an academic paper!)