Giestavia Prixasti
Ballinger , 1984
Buku Teks
Kimball, Dexter S
McGraw-Hi, 1947
Buku Teks
Amrine, Harold T.
Prentice-Hall, 1971
Buku Teks
Saunders, N.F.T. (Norman Frank Tilbury)
Sir Isaac Pitman & Sons, 1946
Buku Teks
Amrine, Harold T.
Prentice-Hall, 1975
Buku Teks