Changing heading of thebibliography

Question

I used \begin{thebibliography} for my bib. I know bibtex is recommended but I finished my work so I would prefer to avoid changes. The heading is "Bibliography" but I'd prefer to have "References".

I though to an issue with babel so I changed from:

\usepackage[english]{babel}

to

\usepackage[american]{babel}

with no results.

I used also \renewcommand{\bibname}{References} but nothing changed. My preamble:

\documentclass[12pt, a4paper, oneside, openright]{report}
\usepackage[T1]{fontenc}
\usepackage[ansinew,utf8,latin1]{inputenc}
\usepackage[english]{babel}

\bibliographystyle{harward}