Broad, C.D.
Littlefield, Adams, 1959
Buku Teks
New York : The Light, 2007,
Majalah, Jurnal, Buletin
Mason, Stephen S.
Henry Schuman, 1953
Buku Teks SO
Needham, Joseph
Cambridge University Press, 1956
Buku Teks SO
Taylor, F. Sherwood
Norton, 1963
Buku Teks SO