EducationBusiness(McGrawHill+PearsonEducation+…) VS Open Source Textbooks: APEX Calculus + OpenIntro Statistics

教育商业：

 

商业教科书服务商：

    Pearson Education, McGrawHill, …

 

开源英文原版教科书：

    leanpub.com:

    OpenIntro.org: Statistics

    APEX: Calculus