APA

(20). Global studies in libraries and information. Berlin [u.a.]: De Gruyter.

Chicago

20. Global studies in libraries and information. Berlin [u.a.]: De Gruyter.

Harvard

(20). Global studies in libraries and information. Berlin [u.a.]: De Gruyter.

MLA

Global studies in libraries and information. Berlin [u.a.]: De Gruyter. 20.