Dooley, D. (2001). Social research methods (4th ed.). Prentice Hall.
Cita Chicago (17th ed.)Dooley, David. Social Research Methods. 4th ed. Englewood Cliffs, N.J: Prentice Hall, 2001.
Cita MLA (9th ed.)Dooley, David. Social Research Methods. 4th ed. Prentice Hall, 2001.
Atenció: Aquestes cites poden no estar 100% correctes.