Dyfyniad APA

DeVellis, R. F. (1991). Scale development: Theory and applications. Sage.

Dyfyniad Arddull Chicago

DeVellis, Robert F. Scale Development: Theory and Applications. Newbury Park, Calif.: Sage, 1991.

Dyfyniad MLA

DeVellis, Robert F. Scale Development: Theory and Applications. Sage, 1991.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.