Bromage, Mary C., author
McGraw-Hill, 1979
Buku Teks
Sant, Tom, author
American Management Association, 2012
eBooks
Holt, Rinehart and Winston of Canada, Limited, 1988
Buku Teks
Bogg, Daisy, author
McGraw-Hill, 2012
Buku Teks
Shurter, Robert L.
McGraw-Hill, 1957
Buku Teks