Rudden, Bernard
Clarendon Press, 1987
Buku Teks SO
Velasquez, Manuel G.
Pearson, 1998
Buku Teks SO
Velasquez, Manuel G.
Pearson, 2006
Buku Teks SO
Litvak, Isaiah A.
McGraw-Hill Ryerson, 1984
Buku Teks
Kerr, Thomas S.
John Wiley & Sons, 1952
Buku Teks