Wheeler, Ruric E.
John Wiley & Sons, 1979
Buku Teks
Miller, Charles D.
Scott, Foresman and Co., 1978
Buku Teks
Bergamini, David
Time Incorporated, 1963
Buku Referensi
Hemming, 1998
Multimedia
Collier, Leonard Dawson
St. Paul's House Warwick Lane, 1973
Buku Teks