op. cit.

剑桥词典

used by writers to avoid repeating the details of a book or article that has already been referred to, when all the details other than the page number are the same
（用於避免重複前文提到的書或文章的細節）同上，同前文所引
Johnson (op. cit., page 53) calls this phenomenon "the principle of minimal effort ". 約翰遜（同上，第53頁）把這種現象稱爲“最小努力原則”。
比較
loc. cit. 返回 op. cit.