A broad range of weblinks for every chapter to further your reading and act as sources.

A useful video about the strange situation technique for examining styles of attachment:
https://www.youtube.com/watch?v=s608077NtNI

The website of the Stony Brook Attachment Laboratory/New York Attachment Consortium is a good source of information and resources on attachment theory:
http://www.psychology.sunysb.edu/attachment/