One nice on-line server for database related literature is http://www.informatik.uni-trier.de/~ley/db/index.html

journals (once a month):

ACM Transactions on Database Systems (ACM TODS)
IEEE Transactions on Knowledge and Database Systems (ACM TKDE)
Data and Knowledge Engineering Journal (DKE)
Information Systems Journal
ACM Transactions on Office Information Systems (ACM OIS)
IEEE Transactions on Software Engineering (ACM TSE)

conference proceedings (once a year):

ACM Special Int. Group on Data Management (ACM SIGMOD)
IEEE Int. Conf. on Data Engineering (ICDE)
Int. Conf. on Very Large Databases (VLDB)
ACM Principles on Database Systems (PODS)
Int. Conf on Information and Knowledge Management (CIKM)
WWW Conference

The above lists are just a subset and there are additional respective sources for database material. In the context of this course, we'll "visit" the library to make you familiar with additional methods of locating material from valid sources. Exclusive use of material from "non-referred" web sites is not sufficient and at times dangerous to one's health :). Know your sources !