-Costikyan, Greg (2002) ‘I Have No Words & I Must Design: Toward a Critical Vocabulary for Games’. In: Frans Mäyrä (ed), CGDC Conference Proceedings. Studies in Information Sciences. Tampere: Tampere University Press, pp. x–y. (page numbers here)
-Church, D., Gamasutra - Features - Formal Abstract Design Tools. Available: http://www.gamasutra.com/view/feature/3357/formal%20abstract%20design%20tools.php
These are two different examples; one coming from a book, the other an article from the internet. They contain the name(s) of the author(s), name of the article, publishers details, page numbers etc. This system allows for an easier and more accessible way to chase up a reference.