We consider the connection between EINSTEIN's, v. FREUD's, and MØLLER's views concerning the energy-momentum problem. First we generalize MØLLER's expressions in such a way that the tetrad need not be orthonormalized. Then we mark out a covering of space-time with holonomic tetrads in the sense given by SCHOUTEN. In case that the covering of space-time with natural bases used to give the components of all quantities, is identical with the marked out covering of space-time with holonomic tetrads, we obtain from the generalized MØLLER's expressions the well known ones given by EINSTEIN and v. FREUD.