Gaya APA
Day, R., Underwood, A.
(1991).
Quantitative analysis
(
6th ed)
.
Englewood Cliffs, NJ:
Prentice Hall.
Gaya MLA
Day, R.A.., Underwood, A.L..
"Quantitative analysis".
6th ed
Englewood Cliffs, NJ:
Prentice Hall,
1991.
Text.