Ronald U.; Andrew Warren; Andrew Goudie. Desert Geomorphology. Taylor & Francis. 1993. ISBN 1-85728-017-2. Darke, Diana; Sandra Shields. Oman: The Bradt
OlyMADMen. [2 June 2024]. Jack Wendele Shields, C.D.. Parliament of Canada. [2019-02-14]. Gerard, Warren. Pierre Berton, 84: Canadian icon was outstanding