Besides the abovementioned books and references these older and already classical books by Minorsky (Nonlinear oscillations) and Andronov & Chaikin (Theory of oscillations) may be of interest, as well as the two volumes by Attle-Jackson, Perspectives of nonlinear dynamics.
Is the book "nonlinear dynamics by Attle-Jackson" the new version of the classical books by Minorsky (Nonlinear oscillations) and Andronov & Chaikin (Theory of oscillations)?
Actullay, I am looking for the new version of the book of "Nonlinear Oscillations by Ali H. Nayfeh, Dean T. Mook", "Nonlinear oscillations by Mickens" etc.
The two volume book of Attle-Jackson has a wider content than the non-linear oscillation books of Minorsky and Andronov and Chaikin, but less details in certain topics specific of nonlinear oscillations.
The nonlinear methods used to construct nonlinear models to describe the dynamics of physical, chemical and biological systems, as well as several related topics of pure mathematics, are developed in "Perspectives of nonlinear dynamics" thinking in the applied scientists. An example of the abovementioned topics of pure mathematics, that is not always well known by applied scientists, is Reubel´s theorem about low order universal differential equations and the implications of Reubel´s theorem for mathematical modeling.
My answer to your question: ("Can anyone suggest me, which book is the most helpful for mathematical modeling of the nonlinear oscillatory problems in dynamical systems?") was oriented to add some books that complement the very good suggestions that appear in the answers of other people.
Perhaps you can give us some additional details so that we can suggest, if it is within our means, some more specific bibliography.
When you make reference to "Nonlinear oscillations by Mickens" , do you mean "Truly Nonlinear Oscillatios: Harmonic Balance, Parameter Expansions, Iteration, and Averaging Methods", "Oscillations in planar dynamic systems" or both books?