Terry, George Robert
Richard D. Irwin, INC, 1958
Buku Teks
Kallaus, Norman Francis, 1924-
South-Western Publishing, 1987
Buku Teks
Littlefield, C.L.
Prentice-Hall, 1956
Buku Teks
Rowley, Jennifer
Kogan Page, 1991
Buku Teks
Leffingwell, William Henry
McGraw-Hill , 1950
Buku Teks