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Need a little help with music theory (Piano)?

I'm reading a book, music theory for dummies and I'm currently in the chapter about harmonic progressions and it has the 7th chords of the C minor scale written out like this:

I - Cm7
ii - Dm7(b5)
III - EbM7
iv - Fm7
V - Gdim7
VI - AM7
vii - Bdim7

It also has the chords written out in notation, but the V and vii degrees do not seem to fit as a diminished chord into the key signature, I don't see how Gdim7 and Bdim7 fit into the key signature as they have keys that aren't flatted/sharped in the key signature (Cmin/EbMajor)

Someone please explain!

Thanks

that is because the book is wrong. If you are working with C natural minor, which follows the key signature, V will be a Gmin7 chord and vii will be a BbMaj7 chord. Most of the time though you will see the 7th degree of the c minor scale raised in both of these chords because it sounds better. So the V will be a G7 chord and the vii will be a Bdim7. The way the book explained this was horrible!

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