Recommendation of a good source on Lyapunov theorem in dynamical systems

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As part of my research I wish to read a full proof of Lyapunov's classic theorem on dynamical systems that for an analytic planar vector field where all Lyapunov/focal values are zero, the local phase portrait is a center. I have not found anything matching this even after extensive search efforts so I turn to the community for salvation. Thanks all

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I do not know how easy to find these books, but all (even excessive) details can be found in one of the following books by Andronov et al:

  1. Qualitative theory of second-order dynamic systems
  2. Theory of Bifurcations of Dynamic Systems on a Plane

(I think this is the first one, but not 100% sure)