Cita APA (7a ed.)

SIMPSON, O. (2003). Student retention in online, open and distance learning. Kogan page.

Cita Chicago Style (17a ed.)

SIMPSON, Ormond. Student Retention in Online, Open and Distance Learning. Kogan page, 2003.

Cita MLA (9a ed.)

SIMPSON, Ormond. Student Retention in Online, Open and Distance Learning. Kogan page, 2003.