WALAI AutoLIB – RSSRSSWALAI AutoLibMathematics for elementary teachers :a conceptual approach /Albert B. Bennett, Ted Nelson.http://www.opac.sskru.ac.th/opac/catalog/BibItem.aspx?BibID=b00033312<img src="https://www.opac.sskru.ac.th/bookcover/33312/33312-fc-t.gif" align="left" height="150" width="120"/>130607Mathematics for elementary teachers :an activity approach /Albert B. Bennett, Jr., L. Ted Nelson.http://www.opac.sskru.ac.th/opac/catalog/BibItem.aspx?BibID=b00000627<img src="https://www.opac.sskru.ac.th/bookcover/627/627-fc-t.gif" align="left" height="150" width="120"/>520302