Mason, Alpheus Thomas,1899-1989
Prentice-Hall, 1964
Buku Teks
Swisher, Carl Brent
University of Chicago Press, 1946
Buku Teks
Ducat, Craig R
Wardsworth Cengage Learning, 2013
Buku Teks
Heringa, A.W.
Metro, 2009
Buku Teks
Stannard, Harold
Adam and Charles Black, 1949
Buku Teks