Pohanish, Richard P.
McGraw-Hill, 1999
Buku Referensi
Kumar, Surender
Oxford & IBH Publishing Co., 1976
Buku Teks
Board, Niir
Asia Pacific Business Press, [tt]
Buku Teks
Jacques Lucas ... [and four others]
Elsevier, 2015
Buku Teks
Dirjendikti Depdiknas, 2002
Buku Teks