Aggregator platforms :


Both subscription model and perpetual access models available

Myilibrary :

One time purchase – perpetual access model available

StatRef :

Subscription base model only

Publisher based platforms :

Access titles from McGrawhill :

Subscription based model

Clinical Key :

Subscription based model – replacing MDConsult in 2014

Karger Medical E-books :

Subscription and perpetual access models

MDConsult e-books :

Subscription based model and a perpetual access model – being replaced by Clinical Key in 2014

Oncology Nursing Society : : -- One time purchase/perpetual access model

ScienceDirect library of e-books : -- one time purchase model

Thieme E-book library : --- Subscription based model

Wiley/Blackwell Library of E-Books : One time purchase model