Artikel Jurnal
Silverstein, Alvin, author
Rinehart and Winston, 1974
Buku Teks
Zhang, Qingling, author
[Springer-Verlag, ], 2012
eBooks
Bruns, Ramon O., author
Burgess Publishing Company, 1974
Buku Teks
Nelson, Gideon E., author
John Wiley & Sons, 1984
Buku Teks