Presidential approval :
a sourcebook /
George C. Edwards III with Alec M. Gallup.
APA Citation
Edwards, G. C., Gallup, A. (19921990). Presidential approval: a sourcebook. Baltimore: Johns Hopkins University Press.
MLA Citation
Edwards, George C, and Alec Gallup. Presidential Approval: a Sourcebook. Baltimore: Johns Hopkins University Press, 19921990.
Warning: These citations may not always be complete (especially for serials).