APA-ийн эшлэл(7 дахь хэвлэлт)
Ristroph, J. (Jun 22, 2003). Distance Tutoring In Engineering Economics: Equivalence Modeling. Association for Engineering Education - Engineering Library Division Papers.
Чикаго-гийн эшлэл (17 дахь хэвлэлт)
Ristroph, John. "Distance Tutoring In Engineering Economics: Equivalence Modeling." Association for Engineering Education - Engineering Library Division Papers Jun 22, 2003.
MLA -ийн эшлэл (9 дэх хэвлэлт)
Ristroph, John. "Distance Tutoring In Engineering Economics: Equivalence Modeling." Association for Engineering Education - Engineering Library Division Papers, Jun 22, 2003.
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