Gerstner, Merrill H.
Sales meetings that sell / Merrill H. Gerstner and Thomas J. Deegan, Jr.
Amacom , 1974
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Adams, J. Alan
Computer-aided heat transfer / J. Alan Adam. David F. Rogers.
McGraw-Hill, c1973
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Berman, Howard J.
The financial management of hospitals / Howard J. Berman, Lewis E. Weeks, Steven F. Kukla
The University of Mincigan, 1982
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Singh, U.K.
International encyclopedia of professional management Vol. 7, sales management
New Delhi : Anmol Publications, 1998,
 Buku Referensi
Rolph, Earl R.
Public finance / by Earl R. Rolph and George F. Break
N.Y. The Ronald Press , 1961
 Buku Teks