Gaya APA
Elementary statistics : a step by step approach. (1997).
Boston:
[s.n.].
Gaya Chicago
Elementary statistics : a step by step approach.
Ed. 3.
Boston:
[s.n.],
1997.
Text.
Gaya MLA
Elementary statistics : a step by step approach.
Ed. 3.
Boston:
[s.n.],
1997.
Text.
Gaya Turabian
Elementary statistics : a step by step approach.
Boston:
[s.n.],
1997.
Print.