etc
Types of Work that Constitute Employment on OPT & Evidence of
https://oie.gatech.edu/isss/types-work-constitute-employment-opt-evidence-employmentAccess to this page has been denied.
https://www.avvo.com/legal-answers/can-an-f1-visa-student-work-for-an-employer-outsid-1838779.html
General
Travel Tips for F-1 Students on OPT or Planning a Change of Status to H-1B - Office of International Students and Scholars (OISS) - Wayne State University
https://oiss.wayne.edu/news/travel-tips-for-f-1-students-on-opt-or-planning-a-change-of-status-to-h-1b-28469Working Abroad on OPT
http://forum.desiopt.com/showthread.php/3511-Working-Abroad-on-OPTCan I work outside USA on OPT? - Quora
https://www.quora.com/Can-I-work-outside-USA-on-OPT