Coursera: https://www.coursera.org/

Online studies: https://www.onlinestudies.com/Courses/International-Trade/ 

The Economist: https://www.economist.com/ 

NTM: https://www.transportmeasures.org/en/wiki/manuals/all-modes/1-2-calculations/ 

How to Logistics: https://howtologistics.com/ 

Lindo: https://www.lindo.com/ 

QGIS: https://qgis.org/en/site/ 

Select Hub: https://www.selecthub.com/tms-software/ 

ACC Library: http://researchguides.austincc.edu/c.php?g=544374&p=5825972 

Wiley Online Library: https://onlinelibrary.wiley.com/ 

Tylor: https://www.taylorfrancis.com/ 

Emerald Insight: https://www.emerald.com/insight/ 

Openstax: https://openstax.org/ 

ProQuest: https://www.proquest.com/ 

Springer: https://www.springer.com/gp 

JSTOR: https://www.jstor.org/ 

J-Stage: https://www.jstage.jst.go.jp/ 

Academia: https://www.academia.edu/