APA
National University Extension Association, . (1953). University extension in the United States. Birmingham: University of Alabama.
Chicago
National University Extension Association, . 1953. University extension in the United States. Birmingham: University of Alabama.
Harvard
National University Extension Association, . (1953). University extension in the United States. Birmingham: University of Alabama.
MLA
National University Extension Association, . University extension in the United States. Birmingham: University of Alabama. 1953.
