A comparative study of selected elementary school mathematics textbooks used in the United States and in Thailand - Valapa Piroonraksa Sangviriyakul, 1946- (Ann Arbor, Mich. : University Microfilms International, 1978)
Thesis (Ph.D.) - University of Northern Colorado, 1978
Keywords: Mathematics -- Study and teaching (Elementary) -- United States; Mathematics -- Study and teaching (Elementary) -- Thailand