APA
Christensen L. B., . (2011). Reseach methods, design and analysis. Allyn & Bacon, Boston: .
Chicago
Christensen Larry B, . 2011. Reseach methods, design and analysis. Allyn & Bacon, Boston: .
Harvard
Christensen L. B., . (2011). Reseach methods, design and analysis. Allyn & Bacon, Boston: .
MLA
Christensen Larry B, . Reseach methods, design and analysis. Allyn & Bacon, Boston: . 2011.