Targ, S., author
Peace, 1962
Buku Teks
Kibble, T.W.B., author
Longman, 1985
Buku Teks
Kibble, T.W.B., author
Longman, 1996
Buku Teks
Fowles, Grant R.
Holt, Rinehart, and Winston, 1977
Buku Teks
Stephenson, Reginald J.
John Wiley & Sons, 1969
Buku Teks