Principles of Psychology

Based in Washington, DC, the APA is a scientific and professional organization that represents psychology in the United States. With 150,000 members, APA is the largest association of psychologists worldwide.

The British Psychological Society is a registered charity and is responsible for the development, promotion and application of psychology for the public good.

The American Psychiatric Association is a medical specialty society with over 38,000 member physicians working to ensure humane care and effective treatment for all persons with mental disorder, including mental retardation and substance-related disorders.

The Royal College of Psychiatrists is the professional medical body responsible for supporting psychiatrists throughout their careers, from training through to retirement, and in setting and raising standards of psychiatry in the United Kingdom.

The mission of the NIMH is to transform the understanding and treatment of mental illnesses through basic and clinical research, paving the way for prevention, recovery and cure

NCBI advances science and health by providing access to biomedical and genomic information.