Open Textbook Library 2016
Springer 2018
AOSIS 2018
Routledge 2017
Open Textbook Library 2020
Open Textbook Library 2024
Open Textbook Library 2023
Open Textbook Library 2018
DOAB 2021
Intech Open 2023
Intech Open 2020
DOAB 2022
West Hills College 2024