SIMPSON, O. (2003). Student retention in online, open and distance learning. Kogan page.
Citazione stile Chigago Style (17a edizione)SIMPSON, Ormond. Student Retention in Online, Open and Distance Learning. Kogan page, 2003.
Citatione MLA (9a ed.)SIMPSON, Ormond. Student Retention in Online, Open and Distance Learning. Kogan page, 2003.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.