DeVellis, R. F. (2003). Scale development: Theory and applications (2a. ed.). Sage.
Cita Chicago (17th ed.)DeVellis, Robert F. Scale Development: Theory and Applications. 2a. ed. Thousand Oaks: Sage, 2003.
Cita MLA (9th ed.)DeVellis, Robert F. Scale Development: Theory and Applications. 2a. ed. Sage, 2003.
Atenció: Aquestes cites poden no estar 100% correctes.