Parichart Sithisarn. 1993. Chemical modification on Bacillus penicillin acylase. Faculty of Graduate Studies, Mahidol University;
Parichart Sithisarn. (1993) Chemical modification on Bacillus penicillin acylase . Mahidol University/Bangkok.
Parichart Sithisarn. Chemical modification on Bacillus penicillin acylase. . Bangkok:Mahidol University, 1993.
Parichart Sithisarn. (1993) Chemical modification on Bacillus penicillin acylase . Mahidol University/Bangkok.