Ewen, David, author
The world of twentieth-century music
Prentice Hall, 1968
 Buku Referensi
Day, Paul W
John Mulgan / Paul W Day
Twayne Publishers , 1968
 Buku Teks
Kelter, Paul B., author
Chemistry : a world of choices / Paul B.Kelter
McGraw-Hill, 2003
 Buku Teks
Avison, John
The world of physics / John Avison.
T. Nelson Australia [distributor , 1989
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Harder, Paul O
Basic materials in music theory a programed course/Paul O. Harder
Allyn and Bacon , 1975
 Buku Teks
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