Electronic/World Wide Web>Internet Article:  Cowen , Tyler (11/16/2013), Nettlesomeness, and the first half of the Carlsen-Anand match, Marginal Revolution, Retrieved on 2013-11-22

Source Material [marginalrevolution.com]

Books, Brochures, and Chapters>Book:  Cowen , Tyler (2011-01-25), The Great Stagnation, Dutton Adult, Retrieved on 2012-01-04

Source Material [books.google.com]