9TASHAKKORI A,TEDDLIE C. Is- sues and dilemmas in teaching re- search methods courses in social and behavioural sciences:US per- spective[J]. International Journal of Social Research Methodology, 2003, 6( 1 ) :61-77.
10NEWMAN I,BENZ C. Qualitative- quantitative research methodology: exploring the interactive continuum [M]. Carbondale: Southern Illinois University, 1998.