Cita APA (7a ed.)

Pierrakeas, C., Xeno, M., Panagiotakopoulos, C., & Vergidis, D. (2004). A Comparative Study of Dropout Rates and Causes for Two Different Distance Education Courses. Athabasca University Press.

Cita Chicago Style (17a ed.)

Pierrakeas, Christos, Michalis Xeno, Christos Panagiotakopoulos, y Dimitris Vergidis. A Comparative Study of Dropout Rates and Causes for Two Different Distance Education Courses. Athabasca University Press, 2004.

Cita MLA (8a ed.)

Pierrakeas, Christos, et al. A Comparative Study of Dropout Rates and Causes for Two Different Distance Education Courses. Athabasca University Press, 2004.