The Library's own compendium on searching for materials and information.
Introduction to modern information retrieval
Chowdhury G. G.
Theoretical discussion of searching, resource types, evaluation of information and many other things.
Barker Donald I.
A quickly read introduction to how to search, both in general and for specific resources.
The elements of library research
George Mary W.
Princeton University Press, 2008
Practical help on how to use library resources to research a topic. Good summaries of the advice are found throughout the book.