Gaya APA
Devellis, Robert F.. (1991).
Scale development : theory and applications .
Newbury Park:
Sage.
Gaya Chicago
Devellis, Robert F..
Scale development : theory and applications.
Newbury Park:
Sage,
1991.
Text.
Gaya MLA
Devellis, Robert F..
Scale development : theory and applications.
Newbury Park:
Sage,
1991.
Text.
Gaya Turabian
Devellis, Robert F..
Scale development : theory and applications.
Newbury Park:
Sage,
1991.
Print.