Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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