SIMPSON, O. (2003). Student retention in online, open and distance learning. Kogan page.
Chicagoスタイル(17版)引用形式SIMPSON, Ormond. Student Retention in Online, Open and Distance Learning. Kogan page, 2003.
MLA(9版)引用形式SIMPSON, Ormond. Student Retention in Online, Open and Distance Learning. Kogan page, 2003.
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