Rudden, Bernard
Clarendon Press, 1987
Buku Teks
Velasquez, Manuel G.
Pearson, 2006
Buku Teks
Litvak, Isaiah A.
McGraw-Hill Ryerson, 1984
Buku Teks
Kerr, Thomas S.
John Wiley & Sons, 1952
Buku Teks
Johnson, Rossall James, 1917-
LPEM - FEUI, 1961
Buku Teks