Rex, Andrew F.
Addison-Wesley , 2000
Buku Teks
Joshi, A.W., author
Wiley Eastern, 1984
Buku Teks
Small, Donald B., author
McGraw-Hill, 1990
Buku Teks
Lightstone, A. H., author
Harper & Row, 1965
Buku Teks
Courant, R., author
Blackie and Son Ltd., 1960
Buku Teks