For a good example of Osgood and Tannenbaum's semantic differential scale http://www.prenhall.com/divisions/hss/app/social/chap7_1.html
And also find out about self-efficacy by reading Bandura (1986) - http://mentalhelp.net/psyhelp/chap14/chap14u.htm
For Heider's Balance Theory http://darkwing.uoregon.edu/~bfmalle/sp/vassilis2.html
Attitude organisation and change
A good source for cognitive congruityhttp://www.ciadvertising.org/studies/student/97_fall/theory/cognitive_coc/congruity.htm
For Leon Festingerhttp://www.ciadvertising.org/sa/spring_03/382j/aclaire/Biography.html
http://www.dushkin.com/connectext/psy/ch15/bio15.mhtml
Read Cognitive Dissonance: Progress on a Pivotal Theory in Social Psychologyhttp://www.apa.org/books/4318830s.html
For an excellent overview of cognitive consistency:http://www.cultsock.ndirect.co.uk/MUHome/cshtml/index.html
Want to know how persuadable you are?http://www.ciadvertising.org/studies/student/97_fall/theory/personality/factors.htm
Attitudes & Behaviour
The psychology of fear appeals at:http://www.msu.edu/~wittek/fearback.htm
Read Erving Goffman and The Presentation of Self in Everyday Life at www.cfmc.com/adamb/writings/goffman.htm
Alternative approaches to the psychology of attitudes