Klesner, Joseph L., author
McGrawHill education, 2014
Buku Teks
Westview Press , 1985
Buku Teks
Magstadt, Thomas M., author
Thomson wadsworth, 2005
Buku Teks
Kesselman, Mark, author
Wadsworth and Cengage Learning, 2013
Buku Teks
edited by Roy C. Macridis, Bernard E. Brown
Dorsey Press, 1968
Buku Teks