Morris, John O.
McGraw-Hill , 1980
Buku Teks
Ewald, Helen Rothschild, author
Prentice-Hall International, 1997
Buku Teks
Locker, Kitty O., author
McGraw-Hill, 2013
Buku Teks
Locker, Kitty O., author
Irwin, 1995
Buku Referensi
Locker, Kitty O.
McGraw-Hill, 2000
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