%0 Journal Article %T Do open educational resources improve student learning? Implications of the access hypothesis %A Andrew E. Waters %A Debshila Basu Mallick %A Phillip J. Grimaldi %A Richard G. Baraniuk %J Archive of "PLoS ONE". %D 2019 %R 10.1371/journal.pone.0212508 %U https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6402753/