R. Hosting, http://www.rackspace.com/blog/rcloud-is-your-cloud-the-openstack- journey

. Home, OpenStack Open Source Cloud Computing Software, Last Modified, p.31, 2014.

D. Chelimsky, In The RSpec book: behaviour-driven development with RSpec, Cucumber, and Friends, Pragmatic, 2010.

D. Pritchard and T. Vasiga, CS circles, Proceeding of the 44th ACM technical symposium on Computer science education, SIGCSE '13, 2012.
DOI : 10.1145/2445196.2445370

D. Knuth, Literate Programming, The Computer Journal, vol.27, issue.2, pp.97-111, 1984.
DOI : 10.1093/comjnl/27.2.97