https://en.wikipedia.org/wiki/John_D._Hannah

https://www.theopedia.com/john-d-hannah

https://www.dts.edu/employee/john-hannah/

https://odbu.org/professors/dr-john-d-hannah/

https://www.facebook.com/people/John-D-Hannah/100081752790322/

https://www.ligonier.org/learn/teachers/john-hannah