Cita APA (7a ed.)

Holmberg, B. (1995). Theory and practice of distance education (2nd ed.). Routledge.

Cita Chicago Style (17a ed.)

Holmberg, Börje. Theory and Practice of Distance Education. 2nd ed. London [etc.]: Routledge, 1995.

Cita MLA (9a ed.)

Holmberg, Börje. Theory and Practice of Distance Education. 2nd ed. Routledge, 1995.