Montgomery, Douglas C.
Gadjah Mada University Press, 1990
Buku Teks
Grant, Eugene Lodewick
McGraw-Hill, 1988
Buku Teks
Pond, Robert J.
Maxwell Macmillan, 1994
Buku Teks
Grant, Eugene Lodewick
McGraw-Hill, 1980
Buku Teks
Cowden, Dudley J.
Prentice-Hall, 1957
Buku Teks