Gliner, J. A., Leech, N. L., & Morgan, G. A. (2009). Research methods in applied settings: An integrated approach to design and analysis (2nd ed.). Routledge/Psychology Press.

Gliner, Jeffrey A., Nancy L. Leech, and George A. Morgan. Research Methods in Applied Settings: An Integrated Approach to Design and Analysis. 2nd ed. New York: Routledge/Psychology Press, 2009.

Gliner, Jeffrey A., et al. Research Methods in Applied Settings: An Integrated Approach to Design and Analysis. 2nd ed. Routledge/Psychology Press, 2009.