BIBLIOGRAPHY:

American Psychological Association.

Publication Manual.

Third ed.

Washington Dc: American Psychological Association.

Ary، Donald، Lucy cheser Jacobs and Asghar Razavieh.

Introduction to Research in Education.

New York: Holt، Rinehart and Winston، Inc، ١٩٧٢.

A Wiley-Interscience Publication.

A Guid For Wiley-Interscience Authors In the Preparation and Producation of Manuscript and Illustration.

New York: John Wiley & Sons، ١٩٧٤.

Berry، Ralph.

How to write a research Paper.

London: Pergamon Press، ١٩٦٩.

Best، John W.

Research in Education.

New Jersey: prentice-Hall، Inc، ١٩٨١.