BibTex is very convenient for inserting reference.

How to declare using BibTex

• declare:

insert

\bibliography{name of the .bib file}

before

\end{document}

• Change style:

insert

\bibliographystyle{unsrt}

along with declaration.

How to make the .bib file.

In most cases, the .bib file can be downloaded from the source of the journal publishers, then just combine them together.