Winterowd, W. Ross
Holt, Rinehart and Winston, 1968
Buku Teks
Fowler, W.S.
Thomas Nelson, 1992
Buku Teks
Stephen A. Ross
Irwin/McGraw-Hill, 1999
Buku Teks
Newcomb, Robert W.
McGraw-Hill, 1966
Buku Teks
Ross, George W.
Macgibbon & Kee , 1959
Buku Teks