Ryan, Daniel
Computer graphics: problems manual
Brooks / Cole Pub, 1983
 Buku Teks
Dana, Forest C.
Engineering problems manual
New York: McGraw-Hill, 1958
 Buku Teks
Soderquist, Larry D.
Corporations : cases, materials, problems
Michie, 1991
 Buku Teks
Whaley, Douglas J.
Problems and materials on secured transactions
Little, Brown & Co., 1993
 Buku Teks
Waddell, Joseph J.
Construction materials ready-reference manual
McGraw-Hill, 1985
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