Cita APA (7a ed.)

Ryland, E. B., Riordan, R. J., & Brack, G. (1994). Selected characteristics of high-risk students and their enrollment persistence. [s.n.].

Cita Chicago Style (17a ed.)

Ryland, Elizabeth B., Richard J. Riordan, y Gregory Brack. Selected Characteristics of High-risk Students and Their Enrollment Persistence. [S.l.]: [s.n.], 1994.

Cita MLA (9a ed.)

Ryland, Elizabeth B., et al. Selected Characteristics of High-risk Students and Their Enrollment Persistence. [s.n.], 1994.