Cita APA (7th ed.)
(2000). Percentage of Students Enrolled in Distance Education Courses: 1995. U.S. Department of Education.
Cita Chicago (17th ed.)
Percentage of Students Enrolled in Distance Education Courses: 1995. U.S. Department of Education, 2000.
Cita MLA (9th ed.)
Percentage of Students Enrolled in Distance Education Courses: 1995. U.S. Department of Education, 2000.
Atenció: Aquestes cites poden no estar 100% correctes.