Book: After Death, Protecting Your 'Digital Afterlife'

Digital archiving to-do handbook by Romano and Carroll. However, no references or bibliography. Minimum citations. How can a book like this, which is neither a fiction nor a personal essay, be written with such a little amount of citations even though it may be written for general audience?
http://www.npr.org/2011/01/10/132617124/after-death-protecting-your-digital-afterlife

The Digital Beyond Website: It provides an digital death related online service list