Kipping, F.B.
W & R Chambers, 1957
Buku Teks
Eaton, David C., author
McGraw-Hill, 1979
Buku Teks
Hatch, Lewis F.
McGraw-Hill Book Company, Inc., 1955
Buku Teks
Loudon, G. Marc, author
The Benjamin/Cummings Publishing Company, Inc., 1995
Buku Teks
Pavlov, B.
Foreign Languange Publishing House, T.t.
Buku Teks