How do your reference the Belmont report in APA style?

(National Commission for the Protection of Human Subjects of Biomedical and Behavioral Research, 1979)

Reference list:

National Commission for the Protection of Human Subjects of Biomedical and Behavioral Research. (1979). The Belmont report: Ethical principles and guidelines for the protection of human subjects of research. Washington, DC: U.S. Government Printing Office.