Have a look at Section 6.6 of Diamond and Shurman, A First Course in Modular Forms:
As an aside, the theorem states a bit more than you have said: for instance, when the field of Fourier coefficients is mathbbQ, you are just asserting the existence of an elliptic curve E/mathbbQ with operatornameEndmathbbQ(E)otimesmathbbZmathbbQ=mathbbQ: every elliptic curve over mathbbQ has this property. You want to require an equality of L-series between the abelian variety and the modular form.
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