@book{cohen_research_2007, edition = {6th}, title = {Research {Methods} in {Education}}, isbn = {978-1-134-20430-4}, url = {https://www.taylorfrancis.com/books/9781134204304}, language = {en}, urldate = {2022-02-21}, publisher = {Routledge}, author = {Cohen, Louis and Manion, Lawrence and Morrison, Keith}, month = may, year = {2007}, doi = {10.4324/9780203029053}, }