Manop Sittidech. 1987. A study of the analysis of some metals by gas chromatography. Graduate School, Chiang Mai University;
Manop Sittidech. (1987) A study of the analysis of some metals by gas chromatography . Chiang Mai University/Chiang Mai.
Manop Sittidech. A study of the analysis of some metals by gas chromatography. . Chiang Mai:Chiang Mai University, 1987.
Manop Sittidech. (1987) A study of the analysis of some metals by gas chromatography . Chiang Mai University/Chiang Mai.