Gaya APA
Levine, M, L, B, M.
(1989).
basic Business Statistics
(
Edisi 4)
.
USA:
PEARSON PRENTICE HALL.
Gaya MLA
Levine, Mark, L., Berenson-David, M..
"basic Business Statistics".
Edisi 4
USA:
PEARSON PRENTICE HALL,
1989.
Textbook.