Cita APA (7a ed.)
Goel, S. L. (2000). Distance education in the 21st century.
Cita Chicago Style (17a ed.)
Goel, S. L. Distance Education in the 21st Century. Distance education in the 21st century, 2000.
Cita MLA (9a ed.)
Goel, S. L. Distance Education in the 21st Century. 2000.
Precaución: Estas citas no son 100% exactas.