Kibble, T.W.B., author
Longman, 1996
Buku Teks
Cini, Michelle, author
Springer-Verlag, 2012
eBooks
Goldstein, Herbert, author
Addison-Wesley Publishing Company, INC, 1950
Buku Teks
Barger, V. (Vernon), 1938-, author
McGraw-Hill, 1973
Buku Teks
Targ, S., author
Peace, 1962
Buku Teks