How to override the numbering type of sources in the bibliography?

Question

Electronic accounting

With a standard set of references in Latex through

\begin{thebibliography}{0}
\bibitem{book1} Первый источник.
\bibitem{book2} Второй источник.
\end{thebibliography}

source numbers are indicated in square brackets:

I need the sources to be numbered through a number and a dot:
1. The first source.
2. Second source.

Answer 1

I found it myself, you need to insert it into the preamble

\usepackage[square,numbers,sort&compress]{natbib}
\renewcommand{\bibnumfmt}[1]{#1.\hfill}

This solution is taken from a rather useful article on Habré, there are many more useful things.