= Representation theory of the Lorentz group
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<Physics from Symmetry by Jakob Schwichtenberg (2015)> page 66 shows one in terms of 4x4 complex matrices.
More importantly though, are the representations of the <Lie algebra of the Lorentz group>, which are generally also just also called "Representation of the Lorentz group" since you can reach the representation from the algebra via the <exponential map>.
Bibliography:
* <Physics from Symmetry by Jakob Schwichtenberg (2015)> chapter 3.7 "The Lorentz Group O (1, 3)"