La Londe, William S.
Frofessional engineers examinations questions and answers
New York: McGraw-Hill, 1991
 Buku Teks
Elonka, Stephen Michael
Standard plant operator's questions & answers
McGraw-Hill, 1981
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Elonka, Stephen Michael, author
Standard plant operator's questions & answers
McGraw-Hill, 1981
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Medical questions?medline has answers
 Artikel Jurnal
Rojanapithayakorn, Wiwat, author
Tuberculosis and HIV : some questions and answers
SEARO, 1999
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