Clyde F. Coombs, editor-in-chief
McGraw-Hill, 1972
Buku Referensi
Clyde F. Coombs, Jr., editor in chief
McGraw-Hill, 1995
Buku Referensi
Money, Steve, author
PC Publishing, 1990
Buku Referensi
Lenk, John D., author
Prentice-Hall, 1981
Buku Referensi
Prensky, Sol D.
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