SAGE Knowledge contains an entire section on counselling psychology and psychotherapy. If you are looking for an overview client groups, professional issues, research methods, theory and approaches, and various counselling skills, then this is a great starting point.
SRM: SAGE Research Methods
SAGE Research Methods is a remarkable new tool created to help faculty, librarians, and students with their research projects. SAGE Research Methods links book, journal, and reference content with instructional materials on research methods concepts that help researchers design projects, understand particular methods, conduct research, and write up findings.
Encyclopedias and Dictionaries held by the UVic Libraries on Counselling Psychology
Reference books and other tertiary resources are often overlooked sources of scholarly knowledge. If you want a great definition of a theory that goes beyond wikipedia, I highly recommend these titles held by UVic Libraries.