Gaya APA
Keppel, G. (1982).
Design And Ainalysis A Researchers Handbook .
Amerka:
Printed in united state of Amerka.
Gaya MLA
Keppel, Geofffrey.
"Design And Ainalysis A Researchers Handbook".
Amerka:
Printed in united state of Amerka,
1982.
Penelitian.