APA (7th ed.) Zitazioa

Johnson, D. L. (1980). Topics in the group presentations. Cambridge University.

Chicago Style (17th ed.) Zitazioa

Johnson, David Leroy. Topics in the Group Presentations. Cambridge: Cambridge University, 1980.

MLA (9th ed.) Zitazioa

Johnson, David Leroy. Topics in the Group Presentations. Cambridge University, 1980.