Cita APA (7a ed.)

Mason, S., Johnson, M. H., & Woolley, C. (1999). A comparison of distractors for controlling distress in young children during medical procedures. [s.n.].

Cita Chicago Style (17a ed.)

Mason, Selwyn, Malcolm H. Johnson, y Cheryl Woolley. A Comparison of Distractors for Controlling Distress in Young Children During Medical Procedures. [S.l.]: [s.n.], 1999.

Cita MLA (9a ed.)

Mason, Selwyn, et al. A Comparison of Distractors for Controlling Distress in Young Children During Medical Procedures. [s.n.], 1999.