Kimball, Dexter S
McGraw-Hi, 1947
Buku Teks
Amrine, Harold T., author
Prentice-Hall, 1971
Buku Teks
Davis, Ralph Currier, author
Harper & Row, 1940
Buku Teks
Duttn, Henry P.
McGraw-Hill Book Company, Inc., 1931
Buku Teks
Saunders, N.F.T. (Norman Frank Tilbury), author
Sir Isaac Pitman & Sons, 1946
Buku Teks