Avapa Chantasartrassmee. 2000. Lattices of subgroups. Department of Mathematics, Silpakorn University;
Avapa Chantasartrassmee. (2000) Lattices of subgroups . Silpakorn University/Bangkok.
Avapa Chantasartrassmee. Lattices of subgroups. . Bangkok:Silpakorn University, 2000.
Avapa Chantasartrassmee. (2000) Lattices of subgroups . Silpakorn University/Bangkok.