1. Campbell, D., Rozmus, B., Clark, N. & Arkles, L. (2003).Best practice checklist for Australian Subject Gateways National Library of Australia.Available from http://www.nla.gov.au/initiatives/sg/bestpractice.html
2. Dublin core metadata initiative. (2003). Retrieved from http://dublincore.org/
3. Information gateways: collaboration on content
4. Quality‐controlled subject gateways: definitions, typologies, empirical overview