Gaya APA
Devellis, Robert F.. (2003).
Scale development : theory and applications (2nd ed.).
Thousand Oaks, CA.:
Sage.
Gaya Chicago
Devellis, Robert F..
Scale development : theory and applications.
2nd ed.
Thousand Oaks, CA.:
Sage,
2003.
Text.
Gaya MLA
Devellis, Robert F..
Scale development : theory and applications.
2nd ed.
Thousand Oaks, CA.:
Sage,
2003.
Text.
Gaya Turabian
Devellis, Robert F..
Scale development : theory and applications.
2nd ed.
Thousand Oaks, CA.:
Sage,
2003.
Print.