  In this paper, we investigate the structure of hybrid stars consisting of
hadrons (neutrons, protons, sigmas, lambdas), leptons (electrons, muons), and
quarks (up, down, strange). We use a relativistic mean-field (RMF) model namely
the Sigma-omega-rho model for the hadronic phase and the MIT bag model as well
as the NJL model for the quark phase. In addition, Maxwell and Gibbs conditions
are employed to investigate the hadron-Quark phase transition. Finally, by
obtaining the mass-radius relation, $ M (M_{sun}) \leqslant 2.07 $ is predicted
for such hybrid stars.
