APA aipamena

Helsel, D. R., & Hirsch, R. M. (1992). Statistical methods in water resources. Elsevier.

Chicago Style aipamena

Helsel, Dennis R., and Robert M. Hirsch. Statistical Methods in Water Resources. Amsterdam ; New York: Elsevier, 1992.

MLA aipamena

Helsel, Dennis R., and Robert M. Hirsch. Statistical Methods in Water Resources. Elsevier, 1992.