Saya mau tau Rujukan dari National Public Radio. Jelaskan dalam bahasa melayu

Gibson, George H. Public Broadcasting: The Role of the Federal Government, 1919–1976 (Praeger Publishers, 1977). .

McCauley, Michael P. NPR: The Trials and Triumphs of National Public Radio (Columbia University Press, 2005). .

Magee, Sara. "All Things Considered: A Content Analysis of National Public Radio's Flagship News Magazine from 1999–2009". Journal of Radio & Audio Media (2013) 20#2 pp. 236–250.