Gratzer, G. The congruences of a finite lattice: A proof-by-picture approach.
芝加哥风格引文Gratzer, George. The Congruences of a Finite Lattice: A Proof-by-picture Approach.
MLA引文Gratzer, George. The Congruences of a Finite Lattice: A Proof-by-picture Approach.
警告：这些引文格式不一定是100％准确.