Entering the era of human ecology :
[report of] the President's Committee on Mental Retardation.
APA Citation
United States. President's Committee on Mental Retardation. (1972). Entering the era of human ecology: [report of] the President's Committee on Mental Retardation. Washington: The Committee.
MLA Citation
United States. President's Committee on Mental Retardation. Entering the Era of Human Ecology: [report Of] the President's Committee On Mental Retardation. Washington: The Committee, 1972.
Warning: These citations may not always be complete (especially for serials).