Tosi, Henry L.
John Wiley & Sons, 1984
Buku Teks
Basic Books, 1972
Buku Teks
savage, William W.
Scott Foresman & Co., 1968
Buku Teks
Denhardt, Robert B., author
Thomson/Wadsworth, 2004
Buku Teks
Denhardt, Robert B., author
Cengage Learning, 2015
Buku Teks