Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) nakato Yasue,Recent Methods of the Questionnaire Research with the Large Sample Size (4): Issue of Purposive Sampling Method,Mathematical Linguistics,04534611,The Mathematical Linguistic Society of Japan,2018-09-20,31,6,461-476,https://cir.nii.ac.jp/crid/1390282752327665920,https://doi.org/10.24701/mathling.31.6_461