Garbutt, John
Waste management law a pratical handbook
John Wiley & Sons, 1995
 Buku Referensi
Topham, Alfred F.
Palmer's company law : a pratical book for lawyers and business men / by Alfred F. Thopam and A.M.R. Topham
Stevens and Sons, Limited, 1933
 Buku Teks
A pratical guide to job analysis
Erich P. Prien, editor
Pfeiffer, 2009
 Buku Teks
Crow, Lester D
Human relations in pratical nursing
Coller-McMilan, 1964
 Buku Teks SO
Tanner, Mike
Pratical Queueing Analysis
McGraw-Hill Company, 1995
 Buku Teks SO