Citazione Stile APA (7a Edizione)

Christensen, L. B., & Johnson, R. B. (2011). Research methods, design, and analysis (Eleventh edition.). Pearson Education, Inc.

Citazione stile Chigago Style (17a edizione)

Christensen, Larry B., e R. Burke Johnson. Research Methods, Design, and Analysis. Eleventh edition. Boston, Massachusetts: Pearson Education, Inc, 2011.

Citatione MLA (9a ed.)

Christensen, Larry B., e R. Burke Johnson. Research Methods, Design, and Analysis. Eleventh edition. Pearson Education, Inc, 2011.