Stone, Bob
NTC Business Book, 1988
Buku Teks
Wilfried Marxer, editor
[, Springer], 2012
eBooks
Capele, Janine, author
Hachette, 1980
Buku Teks
Edward L. Nash, editor in chief
McGraw-Hill , 1992
Buku Referensi
Glendenning, Norman K., author
Academic Press , 1983
Buku Teks