Ahuja, B. N.
Surjeet Publications, 1989
Buku Teks
Henderson, David
New Zealand Business Roundtable , 1998
Buku Teks
Pelton, Joseph N.
Copernicus Cham, 2019
eBooks
Indonesian Institute of Sciences, [date of publication not identified]
Buku Teks
edited by Leo L. Beranek
McGraw-Hill, 1960
Buku Teks