Cita APA (7a ed.)
Christensen,Howard B. (1977). Statistics step by step. Houghton Mifflin.
Cita Chicago Style (17a ed.)
Christensen,Howard B. Statistics Step by Step. Atlanta: Houghton Mifflin, 1977.
Cita MLA (9a ed.)
Christensen,Howard B. Statistics Step by Step. Houghton Mifflin, 1977.
Precaución: Estas citas no son 100% exactas.