Artikel Jurnal
Oparin, A., author
Foreign Languages Publishing House, 1960
Buku Teks
Nicolson, Iain, author
Horus Editions, 1995
Buku Referensi
Brittan, Arthur
Routledge & Kegan Paul, 1973
Buku Teks
Krauskopf, Konrad B., author
McGraw-Hill, 2008
Buku Teks