Citazione Stile APA (7a Edizione)

Holmberg, B. (1960). On the methods of teaching by correspondence. C. W. K. Gleerup.

Citazione stile Chigago Style (17a edizione)

Holmberg, Börje. On the Methods of Teaching by Correspondence. Lund: C. W. K. Gleerup, 1960.

Citatione MLA (9a ed.)

Holmberg, Börje. On the Methods of Teaching by Correspondence. C. W. K. Gleerup, 1960.