How to change the name of abstract and Reference or Bibliography

How to change the name of abstract and References or Bibliography:

To change the names of abstract or reference or bibliography, just the follow the hints given below:

\renewcommand{\abstractname}{ABSTRACT}

It will change the name of abstract from Abstract to ABSTRACT.

For changing the name of References or Bibliography use the following commands:

\renewcommand{\refname}{REFERENCES}

\renewcommand{\bibname}{BIBLIOGRAPHY}

It will change the name of references from References to REFERENCES and the name of bibliography from Bibliography to BIBLIOGRAPHY.