Goel, S. L. (2000). Distance education in the 21st century.
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Chicago Style (17th ed.) Citation
Goel, S. L. Distance Education in the 21st Century. Distance education in the 21st century, 2000.
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MLA引文
Goel, S. L. Distance Education in the 21st Century. 2000.
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警告：這些引文格式不一定是100％准確.