All official papers need references, and the number of references varies according to different requirements. And write according to the format.

For example:

[1] Li Bengui. Research on tax policy to adjust income distribution. [M]。 China Taxation Press, 2004( 1 1).

[2] Thanks. Government intervention theory and government economic function. [M]。 Hunan University Press, 2004.

Use [M] for books and [J] for periodicals and magazines.