Songsak Pongpunviroj. 1992. Flow injection analysis of gold by spectrophotometry. Graduate School, Kasetsart University;
Songsak Pongpunviroj. (1992) Flow injection analysis of gold by spectrophotometry . Kasetsart University/Bangkok.
Songsak Pongpunviroj. Flow injection analysis of gold by spectrophotometry. . Bangkok:Kasetsart University, 1992.
Songsak Pongpunviroj. (1992) Flow injection analysis of gold by spectrophotometry . Kasetsart University/Bangkok.