You can find listings and digital versions of A.A. Puntambekar's works on academic platforms: : Digital copies of various Puntambekar titles, including Theory of Computation EduEngg Formal Language and Automata Theory Technical Publications
While page 126 is your current target, it is a stepping stone to the entire TOC landscape. Puntambekar’s book covers four major units: theory of computation aa puntambekar pdf 126