Smyth, Henry DeWolf
Princeton University Press, 1946
Buku Teks
Dean, Gordon, author
Alfred A. Knopf, 1957
Buku Teks
Woodgate, Gordon Kemble, author
Clarendon Press, 1989
Buku Teks
Hewlett, Richard G., author
Pennsylvania State University Press, 1962
Buku Referensi
International Atomic Energy Agency , 1972
Buku Teks