Kp. A basic course on general algebra / by Ivan Chajda and Kazimierz Głazek. - Zielona Góra, 2000. (Department of Algebra and Geometry, Palacký University of Olomouc, Czech Republic)

Contributions to general algebra 11 / ed. by I. Chajda [et al.]. - Klagenfurt, 1999.

LCC online Oxford online