6Ben A. C. ,Donald J. B. Teaching Programming Concepts Using an Icon-Based Software Design Tool[EB/OL] . http://ewh.ieee. org/soc/es/Nov 1999/11/BEGIN. HTM. 2011 - 04-06.
7Committee on Information Technology Literacy, Being fluent with information technology[R], National Academy of Sciences, Washington DC, Book and web site NSF Contact Number CDA-- 9616681 . 1999.
8Kurland, D.M., R.D. Pea, C. Clement, and R. Mawby, A study of the development of programming ability and thinking skills in high school students, in Studying the novice programmer[M], E. Sotoway and J. Spohrer, Eds. Hiltsdale, New Jersey: Lawrence Erlbaum Associates, Inc., 1989, pp. 83-112.
9Oavis, James S. ;Gary E. Blau, and G. V. Reklaitis. Computers in undergraduate Chemical enginnering Education[J]. Chemical Engineering Education. 1995(29), 1 : 50-55.