The Book entitled “Infinitesimal Under Radiating Primaries” and subtitled “Effects of Radiation of Primaries on Stability of Equilibrium Points in the Elliptical Restricted Three Body Problem” deals with the motion and stability of the infinitesimal mass in the vicinity of the Lagrangian equilibrium points in the elliptic restricted three body problem.The model is studied by considering both the primaries as radiating, assuming that the eccentricities of the orbit of the primaries are small.