1. Universal algebra;Birkhoff, Garrett,1946
2. \bysame, Lattice theory, Amer. Math. Soc. Colloq. Publ., vol. 25, revised ed., Amer. Math. Soc., Providence, R.I., 1948.
3. Congruence lattices of algebras of fixed similarity type. I;Freese, Ralph;Pacific J. Math.,1979
4. Herstellung von Graphen mit vorgegebener abstrakter Gruppe;Frucht, R.;Compositio Math.,1939
5. Lattices with a given abstract group of automorphisms;Frucht, Robert;Canad. J. Math.,1950