1. Lattice Theory;Birkhoff,1967
2. Lattice-ordered rings;Birkhoff;An. Acad. Brasil. Ciênc.,1956
3. Some structure theorems for lattice-ordered groups;Conrad;Trans. Amer. Math. Soc.,1961
4. A survey of f-rings and some of their generalizations;Henriksen,1997
5. Basic Algebra I;Jacobson,1985