Kaiser Danner (24 July 2017). "Alan Cottrell". Academia Europaea. Retrieved 19 December 2017.
aimehq.org
"Sir Alan Howard Cottrell". American Institute of Mining, Metallurgical, and Petroleum Engineers. Archived from the original on 22 September 2020. Retrieved 19 December 2017.
"Sir Alan Howard Cottrell". American Institute of Mining, Metallurgical, and Petroleum Engineers. Archived from the original on 22 September 2020. Retrieved 19 December 2017.