Gaya APA

Levenbach, H., Cleary, J, , P. (1981). The beginning forecaster : the forecasting process through data analysis . Belmont, Calif: Lifetime Learning Pub.,.

Gaya MLA

Levenbach, Hans., Cleary, James, , P.. "The beginning forecaster : the forecasting process through data analysis". Belmont, Calif: Lifetime Learning Pub.,, 1981. Text.