Soisson, Harold E., author
John Wiley & Sons, 1975
Buku Teks
Ramey, Robert L.
Belmont: Wadsworth, 1963
Buku Teks
Prensky, Sol D.
Buku Teks
Srivastava, A.C., author
Vani Educational Books, [Date of publication not identified]
Buku Teks
Turner, J.D., author
Macmillan, 1988
Buku Teks