Leedy, P. D., & Ormrod, J. E. (2005). Practical research: Planning and design (8. bs.). Upper Saddle River, N.J.: Pearson Merrill Prentice Hall.
استشهاد بنمط شيكاغوLeedy, Paul D., and Jeanne Ellis Ormrod. Practical Research: Planning and Design. 8. bs. Upper Saddle River, N.J.: Pearson Merrill Prentice Hall, 2005.
MLA استشهادLeedy, Paul D., and Jeanne Ellis Ormrod. Practical Research: Planning and Design. 8. bs. Upper Saddle River, N.J.: Pearson Merrill Prentice Hall, 2005.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.