Anusak Nidhibhadrabhorn และผู้แต่งคนอื่นๆ. (1999) Quality education : assessment of mathematical cognitive skills and analytical ability of grade 9 students in Gabrielite schools (Thailand). National Institute of Development Administration:ม.ป.ท.Anusak Nidhibhadrabhorn และผู้แต่งคนอื่นๆ. 1999. Quality education : assessment of mathematical cognitive skills and analytical ability of grade 9 students in Gabrielite schools (Thailand). ม.ป.ท.:National Institute of Development Administration;Anusak Nidhibhadrabhorn และผู้แต่งคนอื่นๆ. Quality education : assessment of mathematical cognitive skills and analytical ability of grade 9 students in Gabrielite schools (Thailand). ม.ป.ท.:National Institute of Development Administration, 1999. Print.