Norman, Colin
Norton, 1981
Buku Teks SO
Gribbin, John
Yale University Press, 1999
Buku Referensi
Nicolson, Iain
Horus Editions, 1995
Buku Referensi
Oparin, A.
Foreign Languages Publishing House, 1960
Buku Teks
Wyller, Arne A.
Divina, 1999
Buku Teks SO