Bell, Philip A.
ABS Catalogue, 1999
Buku Referensi
Haslwanter, Thomas
Springer International Publishing , 2016
eBooks
Blyth, Conrad Alexander
Allen & Unwin, 1966
Buku Teks
McClave, James T.
Prentice-Hall, 2000
Buku Teks
McClave, James T.
Dellen Publishing, 1979
Buku Teks