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Thank you. I did as you suggested, and it worked like a charm!

I have to say that different publishing houses have different styles of \documentclass{article} . I had experience of writing an article in LaTeX for a different publishing house, and in that case, I did not need to do anything about ...

In a sample article (for that Elsevier journal), there is the word References,as a title to bibliography.

I wrote an article for an Elsevier journal. Elsevier uses \documentclass{elsarticle} . This {elsarticle} is in TeXLive, which I have on my computer. I wrote bibliography (I have five items in bibliography) in usual manner. Like:

\begin{thebibliography}{9}
\bibitem{dT13}
D. Tobias, The Function ...