Le Boutillier, Cornelia Geer
Columbia University Press, 1950
Buku Teks
Gettell, Raymond G.
Appleton-Century-Crofts, 1928
Buku Teks
Crick, Bernard, author
Routledge & Kegan Paul, 1959
Buku Teks
Mason, Alpheus Thomas,1899-1989, author
Prentice-Hall, 1959
Buku Teks
Weyl, Walter E.
N.Y. Harper & Row , 1964
Buku Teks