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Gaya APA
DeVellis, Robert F.. (1991).
Scale Development : theory and applications .
:
Saga Publications.
Gaya Chicago
DeVellis, Robert F..
Scale Development : theory and applications.
:
Saga Publications,
1991.
Book.
Gaya MLA
DeVellis, Robert F..
Scale Development : theory and applications.
:
Saga Publications,
1991.
Book.
Gaya Turabian
DeVellis, Robert F..
Scale Development : theory and applications.
:
Saga Publications,
1991.
Book.