Gaya APA

Pfaffenberger, R, C., H.P., J. (1981). Statsitical Methods for Business and Economics (I). USA: Richard D. Irwin, Inc.

Gaya MLA

Pfaffenberger, Roger, C.., H.P., James. "Statsitical Methods for Business and Economics". I USA: Richard D. Irwin, Inc, 1981. Text.