Cita APA (7a ed.)
Friend, D. V. (1987). Quantitative methods. Longman.
Cita Chicago Style (17a ed.)
Friend, D. V. Quantitative Methods. London ; New York: Longman, 1987.
Cita MLA (9a ed.)
Friend, D. V. Quantitative Methods. Longman, 1987.
Precaución: Estas citas no son 100% exactas.