Lincoln, George A.
Prentice-Hall, 1957
Buku Teks
Hitch, Charles J.
Harvard University Press, 1961
Buku Teks
Melman, Seymour
Simon and Schuster , 1974
Buku Teks
Hitch, Charles Jr
Harvard Univ. Press , 1961
Buku Teks
Hitch, Charles J.
Harvard University Press, 1963
Buku Teks