Gaya APA

Ramsey, F, L., Schafer, D, W. (2013). The Statistical Sleuth A Course in Methods o Data Analysis (3). United States of America: Brooks/Cole Cengage Learning.

Gaya MLA

Ramsey, Fred, L.., Schafer, Daniel, W.. "The Statistical Sleuth A Course in Methods o Data Analysis". 3 United States of America: Brooks/Cole Cengage Learning, 2013. Text.