Scheaffer, R. L. [. a. (2004). Activity-based statistics: Student guide (Second edition.). Key College Publishing.

Scheaffer, Richard L. [et al.]. Activity-based Statistics: Student Guide. Second edition. Emeryville: Key College Publishing, 2004.

Scheaffer, Richard L. [et al.]. Activity-based Statistics: Student Guide. Second edition. Key College Publishing, 2004.