*https://www.ifla.org/wp-content/uploads/2019/05/assets/uca/unimarc_updates/BIBLIOGRAPHIC/u_b_214_update2019_online_final.pdf

*https://www.ifla.org/publications/unimarc-bibliographic--3rd-edition--updates-2012-and-updates-2016?og=33

*http://rusmarc.ru/rusmarc/mf_det21.htm#b214