Gaya APA

Levenbach, H., Cleary, J, P. (1981). The Beginning Forecaster: the forecasting process through data analysis . Belmont, California: Lifetime Learning Publications.

Gaya MLA

Levenbach, Hans., Cleary, James, P. "The Beginning Forecaster: the forecasting process through data analysis". Belmont, California: Lifetime Learning Publications, 1981. Text.