Gaya APA

Gierke, O, (. (). Political theories of the Middle Age, transl. & introd.by F.W.Maitland. Cet.pertama 1900 . Cambridge UP: 1987.

Gaya MLA

Gierke, Otto., (1841-1921). "Political theories of the Middle Age, transl. & introd.by F.W.Maitland. Cet.pertama 1900 ". Cambridge UP: 1987, . Buku.