Hussachai Sittirug. 1997. The predictive value of science process skills, cognitive development, attitude toward science on academic achievement in Thai teacher institution. Graduate School, University of Missouri-Columbia;
Hussachai Sittirug. (1997) The predictive value of science process skills, cognitive development, attitude toward science on academic achievement in Thai teacher institution . University of Missouri-Columbia/Missouri.
Hussachai Sittirug. The predictive value of science process skills, cognitive development, attitude toward science on academic achievement in Thai teacher institution. . Missouri:University of Missouri-Columbia, 1997.
Hussachai Sittirug. (1997) The predictive value of science process skills, cognitive development, attitude toward science on academic achievement in Thai teacher institution . University of Missouri-Columbia/Missouri.